Respostas

2013-08-29T18:28:11-03:00
7(x-1) -2(x-5) = x - 5
7x - 7 - 2x + 10 = x - 5
7x - 2x - x = - 5 + 7 - 10
4x = - 8
x = -8/4
x = - 2
1 3 1