Respostas

2014-04-14T09:06:31-03:00
8 = 2³
2^x+5 = 2^3(x-1)
2^x+5 = 2^3x-3
x+5 = 3x-3
5+3 = 3x-x
8 = 2x
x =8/2
x = 4