$\left(2x-7\right)\left(2x-1\right)$
$\frac{dy}{dx}-7y=7$
$-2x^4x^3$
$\lim_{x\to0}\left(\frac{e^x-x^x}{x}\right)$
$\frac{8}{-2}$
$-81+81a^2$
$\lim_{x\to-\infty}\left(\frac{x}{\cos\left(-3x\right)}\right)$
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