$-3\cdot\left(\frac{1}{9}a-a\right)$
$\frac{\sqrt{1+3}-2}{1-1}$
$\sqrt[3]{256c}$
$x^2-40x-180$
$\left(x^{3}+10x^{2}+20x-18\right):\left(x+5\right)$
$3r^2+2r-21$
$\left(zy^{-2}x\right)\left(-\frac{1}{5}x^2z^{-3}y\right)$
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