Respostas

2013-09-30T18:32:20-03:00
X= (X/2 + 20/2) - (X/3 - 5/3)
X= 3X/6 + 60/6 - 2X/6 + 10/6
X= X/6 + 70/6
6X= X + 70
5X= 70
X= 14
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