$-4\left(-8v-6\right)-7$
$x'=kx$
$\lim_{x\to0}\left(\frac{\left(sin\:8x\right)}{sin\:2x}\right)$
$4ab-8abc$
$\frac{dy}{dx}\left(\frac{y}{x}\right)$
$\frac{a+b}{2}=5$
$2.5\left(0.5\right)-1.5$
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