Respostas

2013-09-08T11:42:00-03:00
4(x-1)- 2(x+1 = 68
4x - 4 - 2x - 2 = 68
2x-6 = 68
2x = 68 + 6
2x = 74
x = 37


3.x = 111
1 5 1
2013-09-09T00:25:10-03:00