$\left(\sqrt{x}-3y\right)\cdot\left(\sqrt{x}+3y\right)$
$\frac{x^3+3x^2-8x-16}{x+5}$
$-81=x+5$
$\left(x^2+2y^2\right)dy-xydx=0$
$-\left(5xy\right)^2\left(3uv\right)$
$\left(x+5\right)^2\:+\:\left(x-4\right)^2\:-\:2x\left(x+1\right)$
$9b+5b-8$
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