Respostas

2014-06-16T07:39:00-03:00
2x/5 - 4 = 7x - 8 (mmc = 5)
2x/5 - 20/5 = 35x/5 - 40/5
2x - 20 = 35x - 40
2x - 35x = -40 +20
-33 x = -20 (.-1)
33x = 20
x = 20/33