$\lim_{x\to2}\left(\frac{6e^x}{x}\right)$
$r^{2}+20r+100$
$120+x=-62$
$\left(2c-3z\right)^3$
$\frac{10x^4\:-6x^3+2x^2-3x+8}{x-1}$
$x+9=25$
$\frac{\left(-2.2\right)^2+\left(-2.2\right)-2}{\left(-2.2\right)+2}$
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