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2014-11-11T15:27:33+02:00
-0,2x+4=1,2x
4=1,2x+0,2x=1,4x
x=4/1,4=2,85
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2014-11-11T15:28:00+02:00
-0,2x-1,2x=-4
-1,4x=-4/ inmultit cu -1
1,4x=4
x=4 : 1,4 
x=2,85