$\sqrt[2]{-25}$
$21+24\cdot2$
$\int x^2\left(\frac{x^3}{21}+7\right)^6dx$
$\frac{x^2-8x-2}{x+3}$
$\left(3c^2+5ab\right)^2$
$2\cdot\frac{6}{4}$
$\:\:\frac{5^3}{5^1}$
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