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2014-03-02T11:36:43-03:00
4 -2x = x+31
-2x - x = 31 - 4
-3x = 27
x = 27 / -3
x = -9
4 4 4
2014-03-02T11:37:45-03:00
4-2x=x+31
4-31=x+2x
-27=3x
x=-27/3
x=-9
1 5 1