$x^2+2+x+1+x^2+x+1$
$5\left(-2\right)^2\left(4\right)$
$y=\left(x+2\right)dx$
$\frac{dy}{dx}=\frac{-4xy}{x^2+1}$
$f\left(x\right)=\:-3x^5+4x^2-5x^4-7x+6-x$
$\left(-2\right)\cdot\left(2a^2-a-5\right)$
$7x\:-\:3\:-\:19\:+\:5x$
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