Respostas

2014-02-26T18:17:52-03:00
(3x --1) - (2x - 2) = (2x + 6) - (3x --1)
3x -1 -2x +2 = 2x + 6 -3x + 1
3x -2x -2x + 3x = 6+1 +1 -2
6x -4x = 6
2x = 6
x = 3
7 4 7