$x^3-2x^3$
$9\:+\:13\:-\:\:-9\:-\:15\:+\:2$
$\left(\:4\:+\:5\:\right)\:\cdot\:\left(\:6\:+\:3\right)\:$
$33-2x=31$
$-15\left(-4\right)+2\left[-3\:\left(2\right)+\left(6-2\:\left(8\right)\right)\right]$
$\log9=\log\left(2n+1\right)$
$-\frac{1}{6}x=-5$
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