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x-1-3y+1/7=0
x-y=5/2
x-3y=6/7
x=5/2+y
5/2+y-3y=6/7
x=5/2+y
-2y=-23/14
y=23/28
x=5/2+23/28
y=23/28
x=93/28
y=23/28
Mam nadzieje że to jest dobrze