Respostas

2013-10-30T11:32:11-02:00
x+2x-1-3=x
x+2x-x=+1+3
2x=4
x=4/2
x=2

Espero ter ajudado......;D
1 5 1
2013-10-30T11:32:41-02:00
X+2x+x = 4x
-1-3 = -4
x = 4/4
x = 1