Respostas

2014-02-22T20:50:49-03:00
2014-02-22T20:51:31-03:00
4 (x +10) -2 (x - 5) = 0
4x + 40 - 2x + 10 = 0
4x - 2x = 0 - 40 - 10
2x = -50
x = -50 / 2
x = -25