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2014-02-06T15:20:39-02:00
2x-4-8= 4x
2x-12= 4x
2x-4x=12
-2x= 12
2x= -12
x= -12/2
x=-6
25 4 25
2014-02-06T15:31:30-02:00
-2x=12(-1)
2x=-12
x=-6

5 2 5