Question

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

Answer 1

A) (2x - 2)/4 = (3x + 1)/7
7*(2x - 2) = 4*(3x +1)
14x - 14 = 12x + 4
14x - 12x = 4 + 14
2x = 18
x = 18/2
x = 9

B) 6/4 = x/1,8
4x = 6 * 1,8
4x = 10,8
x = 10,8/4
x = 2,7