EJERCICIOS RESUELTOS DE MATEMÁTICAS

Ejercicio 1
x-15	=	-27
x	=	-27+15
x	=	-12

Comprobación

-12-15	=	-27
-27	=	-27
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Ejercicio 2
-11x+12	=	144
-11x	=	144-12
-11x	=	132
x	=	132/-11
x	=	-12

Comprobación

-11(-12)+12	=	144
132+12	=	144
144	=	144
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Ejercicio 3
-8x-15	=	-111
-8x	=	-111+15
-8x	=	-96
x	=	-96/-8
x	=	12

Comprobación

-8(12)-15	=	-111
-96-15	=	-111
-111	=	-111
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Ejercicio 4
6x-10	=	-16
6x	=	-16+10
6x	=	-6
x	=	-6/6
x	=	-1

Comprobación

6(-1)-10	=	-16
-6-10	=	-16
-16	=	-16
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Ejercicio 5
-15x-6	=	9
-15x	=	9+6
-15x	=	15
x	=	15/-15
x	=	-1

Comprobación

-15(-1)-6	=	9
15-6	=	9
9	=	9
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Ejercicio 6
12x+12	=	72
12x	=	72-12
12x	=	60
x	=	60/12
x	=	5

Comprobación

12(5)+12	=	72
60+12	=	72
72	=	72
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Ejercicio 7
-10x+9	=	-81
-10x	=	-81-9
-10x	=	-90
x	=	-90/-10
x	=	9

Comprobación

-10(9)+9	=	-81
-90+9	=	-81
-81	=	-81
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Ejercicio 8
5x-15	=	15
5x	=	15+15
5x	=	30
x	=	30/5
x	=	6

Comprobación

5(6)-15	=	15
30-15	=	15
15	=	15
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Ejercicio 9
2x-13	=	-19
2x	=	-19+13
2x	=	-6
x	=	-6/2
x	=	-3

Comprobación

2(-3)-13	=	-19
-6-13	=	-19
-19	=	-19
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Ejercicio 10
7x+5	=	-100
7x	=	-100-5
7x	=	-105
x	=	-105/7
x	=	-15

Comprobación

7(-15)+5	=	-100
-105+5	=	-100
-100	=	-100
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Ejercicio 11
-12x-15	=	9
-12x	=	9+15
-12x	=	24
x	=	24/-12
x	=	-2

Comprobación

-12(-2)-15	=	9
24-15	=	9
9	=	9
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Ejercicio 12
5x-14	=	-74
5x	=	-74+14
5x	=	-60
x	=	-60/5
x	=	-12

Comprobación

5(-12)-14	=	-74
-60-14	=	-74
-74	=	-74
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Ejercicio 13
13x-13	=	169
13x	=	169+13
13x	=	182
x	=	182/13
x	=	14

Comprobación

13(14)-13	=	169
182-13	=	169
169	=	169
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Ejercicio 14
x-3	=	-13
x	=	-13+3
x	=	-10

Comprobación

-10-3	=	-13
-13	=	-13
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Ejercicio 15
6x+10	=	-38
6x	=	-38-10
6x	=	-48
x	=	-48/6
x	=	-8

Comprobación

6(-8)+10	=	-38
-48+10	=	-38
-38	=	-38
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Ejercicio 16
6x-9	=	-27
6x	=	-27+9
6x	=	-18
x	=	-18/6
x	=	-3

Comprobación

6(-3)-9	=	-27
-18-9	=	-27
-27	=	-27
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Ejercicio 17
-3x+3	=	-33
-3x	=	-33-3
-3x	=	-36
x	=	-36/-3
x	=	12

Comprobación

-3(12)+3	=	-33
-36+3	=	-33
-33	=	-33
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Ejercicio 18
-4x+8	=	4
-4x	=	4-8
-4x	=	-4
x	=	-4/-4
x	=	1

Comprobación

-4(1)+8	=	4
-4+8	=	4
4	=	4
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Ejercicio 19
-14x-7	=	77
-14x	=	77+7
-14x	=	84
x	=	84/-14
x	=	-6

Comprobación

-14(-6)-7	=	77
84-7	=	77
77	=	77
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Ejercicio 20
8x-5	=	-109
8x	=	-109+5
8x	=	-104
x	=	-104/8
x	=	-13

Comprobación

8(-13)-5	=	-109
-104-5	=	-109
-109	=	-109