Respostas

2013-08-28T20:53:22-03:00
5x-7=-9x
5x+9x=7
14x=7
x=7/14
x=0,5
2013-08-29T08:48:29-03:00

5x - 7 = -9x
5x + 9x = 7
14x = 7
x = 14 / 7
x = 2