Question

12x-40 =9x- 10 como resolvo?

Answer 1

12x-40 = 9x-10 => 12x-9x = 40-10 => 3x = 30 => x = 10.

Answer 2

12x - 40 = 9x - 10 ----- 12x - 9x  = - 10 + 40 ----- 3x = 30 ----- x = 30/3

x = 10