$31-\left(-15\right)$
$=2x^4\left(x^2-9x\right)$
$5\left(7n-6\right)$
$\sqrt[3]{5ab}.\sqrt{25a^2}$
$0,\:5y''+3y'+9y=0$
$\int\frac{1+x}{1+x^{2}}dx$
$\left(\sqrt[4]{20x^2}y^3\right)\left(\sqrt[4]{80y^3}\right)$
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