$2v+4\:v^2-6v$
$\sqrt[2]{81a^2b^2}$
$x-5>-9$
$\left(x+17\right)\left(x+9\right)$
$1\:+\:729a^6$
$y'=y+8$
$\left(-79\right)-\left(-25\right)$
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