$8x^6-32x^5$
$\left(-7xy^2-2x^2y\right)\left(x^2+y^2\right)$
$-x+19x-18x$
$x^2-8x\:+\:6\:=\:0$
$-4y+4y$
$m^2\:+\:2m\:+\:1\:=0$
$\lim_{b\to\infty}\left(\frac{e^{-b}}{\left(1+e^{-b}\right)^2}\right)$
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