Respostas

2014-06-01T22:04:58-03:00
7X - 7 -2X  + 6 = X - 5
7x - 2x -x = -5 + 7 -6
          4x = -11 +  7
          4x = -4
            x = -4 / 4
            x = -1 
1 5 1
2014-06-01T22:06:36-03:00
7x-7-2x+6=x-5
7x-2x-x = +7-6-5
7x-3x = +7-11
4x = -4
x= -4/4
x = -1