Respostas

2014-05-22T21:09:11-03:00
+2x-3X=+8
-1x=+8
x = 8
     1
2014-05-22T21:11:08-03:00

 - 3 x - 8 = - 2

-3x = -2 + 8

-3x = +6 (-1)x =  \frac{+6}{3}

x = 2

Espero ter ajudado