$a^2-a^2b-7a^2b+9ab^2$
$\frac{d^2}{dx^2}\left(log\left(x-y\right)\right)$
$a^7b^8-a^4b^{10}+a^5b^6$
$\left(\frac{n^{5x}}{n^{3x+1}}\cdot\frac{n^{2x}}{n^3}\right)^{x-2}$
$8x-16-7x-21$
$13y^2+26y$
$\sqrt{75k^4}$
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