Respostas

2014-09-04T14:38:58-03:00
X+2x-1-3=x
2x=4
x=2
espero ter ajudado
2014-09-04T14:39:15-03:00
X + 2x - 1 - 3 = x

x + 2x - x = 1 + 3
2x = 4
x = 4
     2
x = 2