$7x-1-7xy+y$
$\frac{18x^5}{-6x^3}$
$\frac{dy}{dx}=\frac{x^2+1}{yx+2x}$
$\lim_{x\to5}\left(7x-2\right)$
$\left(2x^3+2x+1\right)\cdot\left(x^2-x-1\right)$
$\frac{0^4}{4}$
$x^2+1x+5$
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