$x^2-9x-72$
$4x^220x+25$
$-36=18$
$7\left(x\:-\:2\right)$
$\left(5x^2+2^2\right)$
$\lim_{x\to\infty}\left(1+\frac{1}{x}\right)^{2lnx}$
$9v+v$
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