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2014-08-31T14:49:26-03:00
9-4x-4=x+7-1
-4x-x=7-1+4-9
-5x=1
x=-1/5
1 5 1
2014-08-31T14:49:31-03:00
-4x -x = 7-1 -9 +4
-5x = 1
x = -1/5