$-79-\left(-20\right)$
$\lim_{x\to4}\left(\frac{2x^3-128}{x^2-16}\right)$
$5\left(-1\right)^2\left(2\right)^3\left(\frac{1}{2}\right)$
$\left(x^2+y^2\right)\frac{dy}{dx}+xy=0$
$\int x\left(2^x-x\right)dx$
$\left(4y^2\cdot4y^2\cdot2y\right)^3$
$\lim_{x\to\infty}\left(\frac{x^a}{e^x}\right)$
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