$\frac{d}{dx}log7\left(xe^x\right)$
$\int\left(\frac{\left(x+1\right)}{\sqrt{x^2+2x+4}}\right)dx$
$42\:-7x$
$-20\cos\left(x\right)+10=0$
$\frac{dy}{dx}\left(x^2+2xy+y^2-2y+9\right)$
$2x+3y-2y-x$
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