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2014-08-12T20:18:49-03:00
2x +1 = 4x -7
2x-4x = -7 -1
2x = -8 (*-1)
2x= 8
x = 8/2
x = 4

8 4 8
2014-08-12T20:19:20-03:00
2x+1=4x-7
2x-4x=-7-1
-2x=-8 (*-1)
2x=8
X=8/4
X=2
5 4 5