Respostas

A melhor resposta!
2014-05-25T20:26:37-03:00
2x + 5x + 7 = 0
2x + 5x = 0 - 7
2x + 5x = -7
7x = -7
x = -7/7
x = -1
3 5 3
2014-05-25T20:27:39-03:00