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x+y-2=2 (to rownanie podzielilem stronami przez 4)
3x-10x+5y=-6+2
x+y=2+2
-7x+5y=-4
x+y=4 /*7
-7x+5y=-4
7x+7y=28
------------- +
12x=24 /:12
x=2
2+y=4
y=2
Odp. x=2, y=2.