$4\left(-5w-8\right)-4w$
$a^2+5^2$
$\frac{dy}{dx}=\frac{4y}{xy-2x}$
$\lim_{x\to0}\left(\frac{a\cdot sen\left(x\right)-x\cdot e^x}{x^2}\right)$
$\frac{f^8}{f^3}$
$-40\:x\:-3$
$\frac{-8a+12ab-4b^2}{b-a}$
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