Question

EQUAÇOES 


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) 3,5x8=2.(x7)= 

Answer 1

a) 4x+4=12
4x=12-4
4x=8
x=8/4
x=2

b) 15x-5x-4x=18
6x=18
x=18/6
x=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

3,5x8=2.(x7)=
28x=14x nao entendi ????