$\left(x\:+\:6\right)\left(x\:+\:9\right)$
$\left(m+n\right)^7$
$3x+4;\:x=2\:y=4$
$\left(a^{x+1}+1\right)^2$
$\frac{dy}{dx}=xe^{2x-y}$
$\frac{dy}{dx}+3y=x+e^{-x}$
$26=-12x-9+7x$
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