$\log_{-3}\left(-45\right)$
$-21-\:15g$
$4\cdot y+7\cdot y-5\cdot y$
$\left(x+2\right)\left|\left(x+2\right)^2-4x+\left(x-2\right)^2\right|-16$
$\frac{1}{2}x^2-\frac{1}{2}x$
$\sqrt[3]{2a^2b^2}\sqrt[3]{a^2b}$
$a+5-c-b-c-2c-a$
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