$5\left(r+2\right)-\left(r+2\right)$
$\left(2+3\right)+x^2\left(2\right)\left(3\right)$
$\left(8y-9x\right)^2$
$\:87+174+109$
$\frac{uv^{-1}}{2uv^{-2}}$
$\frac{d}{dx}y=\left[\frac{1}{\left(x^3-x+1\right)^2}\right]$
$\:\frac{x^3+2x-3}{x-1}$
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