$x^{2\:}+12x=18$
$\left(\frac{3}{4}xyz\right)\left(-\frac{2}{5}z^4\right)$
$3x^2-9x$
$\frac{1}{n\cdot3^n}\cdot\left(2x+3\right)^n$
$w\:-\:7w$
$\left(-4abc\right)\left(-3a^2b^2\right)\left(2ab^5c^7\right)$
$7\:-4\:3\:28$
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