$x-13=44$
$x^3+2x^2-1$
$\lim_{x\to\infty}\left(\frac{x}{1+x}\right)$
$\left(a^2b^4c\right)^4$
$2b+2c$
$\frac{2x+2h-1}{2x+2h+1}+\frac{2x+1}{2x-1}$
$x\frac{dy}{dx}=-3y$
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