Question

resolva as equaçoes:
a. 4(x+1)=12
b. 5(3-x)-4x=8
c. 9x-3(2x+2)=15
d. 2,5(x-2)-1,5=1
e. 3,5x+8=2(x+7)

Answer 1

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

B) 5(3-x)-4x=8
15 - 5x -4x =8
-5x -4x = 8 - 15
-9x = - 7 .(-1)
9x= 7
x= 7/9
x= 

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)-1,5=1
2,5x - 5 - 1,5 =1
2,5x= 1 +5 +1,5
2,5x= 6+1,5
2,5x= 7,5
x= 7,5/2,5
x=3

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

Espero ter ajudado!