Respostas

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2014-06-18T02:35:14-03:00
(x+15+2x-20-x+25+x+3x) / 2 = 540
(7x - x + 40 - 20) / 2 = 540
(6x + 20) / 2 = 540
6x + 20 = 1080
6x = 1060
x ~ 176,67

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