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2y2 - y = 8 + 2y2
-y = 8 /: (-1)
y = -8
y2 - y do potęgi drugiej
2y^2=2(4+4y+y^2)
2y^2=8+8y+2y^2
2y^2-2y^2-8y=8
-8y=8/:(-8)
y=-1