$9r\:-\:55\:=\:-9r\:+\:53$
$\left(a+2\right)^2\cdot\left(a-2\right)^2$
$-\frac{x^2+y^2+2x}{2xy}$
$67e\cdot5$
$8y^3-1$
$+100x+50$
$\frac{d}{dx}\sqrt[3]{\frac{\left(x^2+2\right)^4}{\left(2x+1\right)}}$
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