(y^2-2y)^2 -y^2(y^2-9)+2y(2y^2+5)
y^4-4y-2y^2+9y^2+4y^2+7^y
y^4-2y^2+9y^2+4y+7y
y^4-11y^2+11y
y^4-11y
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(y^2-2y)^2 -y^2(y^2-9)+2y(2y^2+5)
y^4-4y-2y^2+9y^2+4y^2+7^y
y^4-2y^2+9y^2+4y+7y
y^4-11y^2+11y
y^4-11y