$-3\frac{1}{4}x\left(-2\frac{3}{5}\right)$
$\sqrt[3]{x^3y^3}$
$3x+5\ge7$
$\frac{169yx}{\left(y-13\right)\left(x-13\right)\left(x+y\right)}$
$-8n+10n^2-2n+12n^2-5n$
$1+62$
$\frac{20\left(20+1\right)\left(2\left(20\right)+1\right)}{6}$
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