Respostas

2013-10-12T18:19:59-03:00
4 . 2,09 + 5x = 20 - 3, 64 = 16,36
8,36 + 5x = 16,36
5x = 16,36 - 8,36
5x = 8
x = 8/5
x = 1,6
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