$8m^3n-16m^2n^2$
$x^2+21x+9$
$20m^2n^2\:-\:60mnp\:+\:45p^2$
$4\left(x+1\right)-2\left(x-6\right)>-10$
$\frac{4\left(\frac{z^4}{z^8}\right)}{7\left(z^4\left(z^6\right)\right)}$
$y^'=x^3y$
$12-\left(24-\:\left(-12+\:\left(-8+18-6\right)\right)\right)$
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