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2014-10-19T10:33:17+03:00
Cel mai inteligent răspuns!
2014-10-19T10:37:44+03:00
-0,2x+4=-1,2x |+0,2x <=> <=>4= -1,2x +0,2x<=> <=>4=x(-1,2+0,2)<=> <=>4=x•(-1)<=> <=>4=-x<=> <=>x=-4