4y-x=6
7y=0
skoro 7y=0 to y=0:7 y=0 4*0-x=6 0-x=6 czyli x=0-6 x=-6
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skoro 7y=0 to y=0:7 y=0 4*0-x=6 0-x=6 czyli x=0-6 x=-6