$\lim_{x\to\infty}\left(\frac{2e^{-x}}{\ln\left(1+7e^{-x}\right)}\right)$
$6f-9f+9f$
$\:81x^{2a}-16x^2^{a+2}$
$x^2-2x-169$
$\frac{1}{2}+\frac{-8}{16}$
$-3x+5<4-x$
$\:\lim_{x\to1}\frac{\sqrt{x+3\:\:\:}\:}{x-1}-2$
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