$9x\:+\:9y\:=\:9xy$
$3n^5+n^4-3n-1$
$\int_0^{\infty}x^7e^{-x}dx$
$10x+36-38x-47$
$5a\times10b$
$a2\:-\:24a\:+\:144$
$\frac{x^3-8x-2}{x+5}$
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