$\sqrt[3]{\left(-8\right)\left(2\right)}^{-2}$
$7a+21$
$2-10+8-\left(-2\right)$
$-4.5-2.34-12-0.08$
$y''-9y=0$
$15\sqrt{a^2b}-4\sqrt{b}+7\sqrt{b^3}$
$\int\left(2x^2\left(2x^3+4\right)^4\right)dx$
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