$16x^4-56x^2+49$
$2\left(27+\left(x+y\right)\right)=2\left(\left(y+27\right)+x\right)$
$6x-9=3x-6$
$\frac{-x^3+8}{2x^2}$
$8ab-15ab\:+3ab\:-ab\:+6ab$
$81m^2+36m+16$
$\frac{5y-2y^2+1}{\sqrt[3]{y}}$
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