$9r\:-\:55\:=\:-9r\:+\:53$
$\frac{\sin\left(2x\right)}{\cos\left(2x+1\right)}$
$2x-5y=-22$
$\frac{d}{dx}\left(x^x\right)\left(x+1\right)^2\left(8x^2-5\right)$
$\left(x+2\right)^2+12\left(x+2\right)+27$
$\frac{d}{dx}2e^{-1}$
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