$2>\frac{p}{20}$
$36+21c^2-132c$
$2x\sqrt[2]{4^4}x\sqrt[2]{2^{-2}}$
$3\left(a^2+7+b^2\right)$
$\left(5a^9\:+\:7b^9\right)^2$
$\left(2x+3\right)^4=3y^4$
$\frac{dy}{dx}=\:y^2+9$
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