$4m+5\sqrt{n}-m+6m-3\sqrt{n}$
$13-2\left|11-2\left(5-2\right)\right|$
$x^4+x^2-\frac{8}{x-3}$
$\int x 5 ^ { x } d x$
$5y^3\:-\:10xy^2$
$\sin\left(1.6x\right)=-\frac{5}{8}$
$\left(7s+2t\right)\left(7s-2t\right)$
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