$\left(x+3y-4z\right)\left(x-y+z\right)$
$\frac{2x+8}{x-2}=-1$
$15x^8\:+\:20x^6\:$
$\frac{30.888}{15.600}$
$\:729rtsx:-9rt$
$\left(4a^2n+9\right)^3$
$14n+35+28n+7$
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