Respostas

2014-08-11T23:31:44-03:00
X+2x+3-5x=4x-9
3x+3-5x=4x-9
3x-5x=4x-9-3
-2x-4x=-9-3
-6x=-12 (-1)
6x=-12
x=12/6
x=2
1 1 1
2014-08-11T23:31:58-03:00
X+2x+3-5x=4x-9
3x+3-5x=4x-9
8x+3= 4x-9
8x-4x+3=-9
4x+3=-9
4x=-3-9
4x= -12