$4y-12+8y$
$\frac{x^4y^4-64a^6}{x^2y^2+8a^3}$
$\left(-1\right)^{n+1}\left(\frac{2^{n-1}x^n}{n}\right)$
$\frac{\left(4h^5\right)^2}{20h^8}$
$\left(x^2+1\right)\left(x+1\right)^2$
$6^2-2x+4$
$-2x^2-x+28$
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