$\frac{2x^2+16x-18}{x^2e^x+2xe^x-3e^x}$
$\left(\frac{1}{4}m+n\right)\left(-\frac{1}{4}m+n\right)$
$x>6-2x$
$\lim_{x\to0}\frac{10^x-1}{2^x-1}$
$\lim_{n\to\infty}x\left(\sqrt{x^2}+1-x\right)$
$\lim_{x\to\infty}\left(1-\frac{1}{x}\right)^{.2x}$
$40x^3y-51x^3$
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