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4x²+2xy+6x+2xy+y²+3y+6x+3y+9-4xy-6y=y²+12x+109
4x²+12x+y²+9=y²+12x+109
4x²+12x-12x+y²-y²=109-9
4x²=100 /;4
x²=25
x=√25
x=5 lub x=-5