$\frac{x^3-1}{x^5-6x^4+12x^3-8x^2}$
$35-73d-75-3d+1+7d$
$16x^4y^2-25a^4$
$1x^2+4x+4$
$\left(9x^2y-7xy^2\right)^2$
$-84ab-16ab$
$4y^2+y=0$
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