Respostas

2014-05-31T16:10:11-03:00
9x-8=12x-30



- 8  + 30 = 12x - 9x


22 = 3x

x =  \frac{22}{3}
2014-05-31T16:10:43-03:00
9x-8=12x-30

9x-12x=-30+8
-3x=-22 (-1)
x=22/3
1 3 1