$u^2+20u-72$
$\left(x^3+y\right)^2\left(x^2-y\right)^2\left(x^4+y^2\right)^2$
$\frac{x^2-5x+1}{x^2-4x+3}$
$3y-3y^2-4y^2+9y$
$\left(b^2-3b+7\right)^2$
$2x+7x+x-8x$
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