Question

calcule o X sabendo que a//b//c

Answer 1

Boa tarde!

(2x - 2) ---- 4
(3x + 1) --- 7 

Multiplica cruzado..

7(2x - 2) = 4(3x + 1)

aplica a distributiva 

14x - 14 = 12x + 4

14x - 12x = 4 + 14

2x = 18

x = 18 / 2

x = 9 

Bons estudos!