$\left(y+1\right)+\left(y-1\right)\left(1+x^2\right)\left(\frac{dy}{dx}\right)=0$
$\left(x-21\right)\left(x+3\right)$
$\left(3a+4\right)+\left(0-2\right)$
$cotx=-8$
$\int\left(e^x\right)\left(1+e^{2x}\right)^{-1}dx$
$4x-20>0$
$3\left(x-4\right)=2\left(-2x+1\right)$
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