$36m^2-81n^2$
$9\left(2x\:-\:4\right)+7x+5$
$\frac{30a^{11}b^9}{10a^2b^4}$
$4-3-\left(6-3\right)$
$x+2x+5x-4y+7y-5y$
$\left(5+y\right)\left(8+y\right)$
$\left(\frac{1}{x}+\sqrt{x}\right)^4$
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