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2014-04-25T21:12:16-03:00
19+2x-13=10-20
2x = 10 - 20 - 19 + 13
2x = -16
x = -16 / 2
x = -8
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2014-04-25T21:13:51-03:00
19+2x-13=10-20
2x=10-20-19+13
2x= -16
x= -16/2
x= -8
-8.
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