Respostas

2014-04-09T17:42:29-03:00
3.(2x-3)-3x+12 = 27    
6x-9-3x+12 = 27
6x-3x = 27+9-12
3x = 24
 x = 24 / 3
 x = 8
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10 - 2x = 3x
-2x-3x = -10  (.-1)
5x = 10
 x = 10 / 5
 x = 2

2 3 2