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x-2y=2
sory ale zapomniałem jak sie to robi;p
x-2y=2
x=2+2y
x²=0-y²+16-6y
(2+2y)²=16-6y-y²
4+8+4y²=16-6y-y²
4y²+6y+y²=16-12
5y²+6y=4