Question

resolva

A) 4(x+1)=12

B) 5(3-x)-4x=18

C) 9x-3 (2x+2)=15

D)2,5(x-2)-1,5x=1

E) 3,5x+8=2(x+7)

F)6(3x+2)-8=-2

G) -3(x-5)-2(2x+1)=-8

Obs:todas precisam de calculos

Answer 1

Espero ter ajudado, segue a foto do exercício.

Answer 2

A) 4(x+1)=12
4x + 4 = 12
4x = 12 - 4
4x = 8
x = 8/4
x = 2

B) 5(3-x)-4x=18
15 - 5x - 4x = 18
- 9x = 18 - 15
- 9x = 3
- x = 3/9 (÷3)
- x = 1/3 .(-1)
x = - 1/3

C) 9x-3 (2x+2)=15
9x - 6x - 6 = 15
3x = 15 + 6
3x = 21
x = 21/3
x = 7

D)2,5(x-2)-1,5x=1
2,5x - 5 - 1,5x = 1
x = 1 + 5
x = 6

E) 3,5x+8=2(x+7)
3,5x + 8 = 2x + 14
3,5x - 2x = 14 - 8
1,5x = 6
x = 6/1,5
x = 4

F)6(3x+2)-8=-2
18x + 12 - 8 = - 2
18x = -2 + 8 - 12
18x = - 6
x = -6/18 (÷6)
x = -1/3

G) -3(x-5)-2(2x+1)=-8
-3x + 15 - 4x - 2 = -8
-7x = -8 - 15 + 2
-7x = - 21
- x = - 21/7
- x = - 3 . (-1)
x = 3