Respostas

2014-08-30T11:19:47-03:00
10x + 100 = 20
10x = -100 + 20
10x = - 80
x = -8
2014-08-30T11:22:59-03:00
10x + 100 = 20
10x = 20 - 100
X = -80
X = -80/10
X = -8