$2u\:-\:6u$
$-4n-n$
$\frac{7r^3s^2}{6rs^2}$
$\left(v^4\right)^3$
$\left|-15\right|\left|-15\right|-\left|14\right|$
$adb-b^2da=0$
$\frac{-30x+2+3x^2+2x^3}{x-3}$
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