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x-y =6
x=8-y
(8-y)-y=6
x=8-y
8-2y=6
x=8-y
-2y=-2
x=8-1
y=1
x=7
y=1
sprawdzenie:
7+1=8
7-1=6
x-y =6
x=8-y
8-y-y=6
-2y=-2
x=8-y
y=1
x=7
7+1=8
7-1=6