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2014-07-27T23:59:45-03:00
5(x - 8) + 2(2x + 2) = 0
5x - 40 + 4x + 4 = 0
5x + 4x - 40 + 4 = 0
9x - 36 = 0
9x = 36
x = 36/9
x = 6

1 5 1
2014-07-28T00:00:54-03:00
A ) 
5 ( x - 8 ) + 2 (2x + 2 ) = 0
5x - 40 + 4x +4 = 0
5x + 4x - 36 = 0
9x - 36 = 0