Respostas

2013-11-26T01:33:26-02:00
9x + 5 = 4x
9x - 4x = - 5
5x = - 5
x = - 5/5
x = - 1
2013-11-26T01:35:04-02:00
9x + 5 = 4x
9x - 4x = - 5
5x = - 5
x = - 5 : 5
x = - 1