$\int\frac{5x+81}{x^2-81}dx$
$\int_0^2\left(1x+4x\right)dx$
$\sqrt[4]{\sqrt[7]{81m^4}n^8}$
$\left(+5\right)\:-\:\left(-2\:+\:4\right)$
$-7h+-10h$
$\left(a^4y^2\right)^{10}$
$\frac{\left(4x-6\right)\left(2x+12\right)}{2}$
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