Respostas

2014-05-26T20:36:50-03:00
12x+7-3x = 2 -5x + 19
84-3x2-5x+19
84-6-5x+19
84-6-95
78-95
-17


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2014-05-26T20:37:00-03:00
12x -3x +5x =  -7 +2 +19
14x = 14
x = 14/14
x = 1
1 5 1