Question

calcule x, sabendo que a//b//c.

Answer 1

Olá

a)

2x - 2 ----- 4
3x + 1 ---- 7

multiplica cruzado.

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

14x - 14 = 12x + 4 

14x - 12x = 4 + 14

2x = 18

x = 18 / 2 

x = 9 

b)

6 --- (3 + 6)
x ----  6

6² = 9x

36 = 9x

x = 36 / 9

x = 4