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(4x-1):3-(y-3):6=-2(x-y) /*6
2x-6-5y-5=10-10x+10y
8x-2-y+3=-12x+12y
12x-15y-21=0 /*5
20x-13y+1=0 /*3
60x-75y-105=0
60x-39y+3=0
(odejmujemy stronami)
-36y-108=0
-36y=108
y=-3
20x+39+1=0
20x=-40
x=-2
y=-3