$\frac{a^4}{a^6}$
$\frac{d}{dx}\left(\frac{\left(x+1\right)}{x^2\left(3x-4\right)}\right)$
$\left(x+2y\right)dx\:+\:\left(-2x+y\right)dy=0$
$x-2y-3z=-1$
$2\cos\left(x\right)+2$
$2ab+5c+5a+2cb$
$k-2k$
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