$y'=\frac{x+xy}{1+x^2}$
$\left(x-2\right)\left(-6x-7\right)$
$\lim_{x\to0}\left(\frac{1-x\cos\left(x\right)}{sin^23x}\right)$
$5a+5b-5c$
$\frac{-2}{3}x+x$
$\sqrt{4y+1}+5=y$
$-31x^2+220x-204$
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