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y=2x-3
y-x=-1 *(-2)
y-2x=-3
-2y+2x=2
y-2x=-3
-y=-1 *(-1)
y=1
y=x-1
-x=-y-1
-x=-1-1
-x=-2/*(-1)
x=2
Sprawdzenie
y=x-1
1=2-1
1=1