$9x-2-13x+16$
$4\log\left(x\right)-\log\left(2\right)$
$81y^2+54y$
$5s\:-\:7\:+\:t\:-\:t$
$5x-7x+7x-8x+9x-x$
$\lim_{x\to0}\left(\frac{cos\left(x-\frac{\pi}{2}\right)}{cos\left(x+\frac{\pi}{2}\right)}\right)$
$\left(x^a-4\right)\left(x^a-12\right)$
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