Respostas

2014-05-08T00:17:22-03:00
Letra a
x - 12
letra b
x = 3

1 1 1
2014-05-08T00:28:49-03:00
X+2 +3X = 5( X - 2 )

X+ 3X +2 = 5X -10
X+3X -5X = -10
-X = -10 -2
-X= -12
X=12
2 3 2