$\lim_{x\to\infty}\left(x^7e^{-x}\right)$
$\frac{1}{1-8x^3}$
$4x^2+1x+49$
$\frac{3x^2+4x+10}{x\:-\:2}$
$5\:x\:5\:x\:5\:x\:5\:x\:5$
$3\left(a+8\right)$
$-5+4\left(-7\right)$
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