$\left(y+10\right)\left(y-20\right)$
$-3^3-18^2+27x+42$
$-2c+c-3c-c$
$\left(x+2\right)\left(x-20\right)$
$-\frac{\pi}{6}+\frac{3\pi}{2}$
$\left(6^{n+3}-b^{-3}\right)^2$
$\frac{7m}{13}\left(\frac{13m}{17}+\frac{17n}{3}\right)-\frac{3n}{7}\left(7+\frac{7m}{13}\right)$
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