$\frac{d}{dx}\frac{x^2+1}{e^x}$
$-33,64+-16$
$-4+100m^2$
$\int_{-1}^24xdx$
$4^2.3$
$9r\:-\:55\:=\:-9r\:+\:53$
$\left(2x+7\right)+\left(2x+7\right)+\left(2x\right)+\left(2x\right)$
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