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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-y
-y=-1
y=1
x=8-1
y=1
x=7
y = 1
x-y=6
x=y-6
y-6+y=8
2y=8+6
2y=14
y=7
y=6-x
y-6-y=6
-6=6
dana para liczb nie spełnia układu równań
nie da sie wyliczyc x