$2x-5<3x+10$
$\frac{2y\:\tan\left(y\right)+\tan\left(y\right)}{1-2y\:\tan\left(y\right)+\tan\left(y\right)}$
$\left(1+2\right)\left(5+2\right)$
$36m^2-18m-10$
$\frac{x}{x^2+x-20}$
$\log_{2019}\left(x^2-x+1\right)=\log_{2019}\left(x-9\right)$
$\frac{20a^2b^2}{-10a^5b}$
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