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2014-04-17T21:31:37-03:00
5 x + 1670=    7 x
5 x - 7 x = - 1670
- 2 x = - 1670 (-1)
2 x = 1670
x = 1670/ 2 = 835
conferir
7*835=5845
5 * 835 + 1670= 4175+1670= 5845

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