$\:\:+\:12x\:=\:0$
$\left(-a^{n+1}b^{n+2}\right)\left(a^{n+2}b^n\right)$
$2\left(a-4b\right)$
$x^2+6x-168=0$
$\frac{dy}{dx}\left(\frac{y}{x}-5x^3=5\right)$
$x^3t+2x^2t^2x'=0$
$b^2-b-20$
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