$-23-5+19-1+4-23-5+19-1+4$
$\lim_{x\to1}\left(\frac{x^2+3}{\left(2x-1\right)\left(x+1\right)}\right)$
$\frac{12x^8y}{20xy^4}$
$2a+3b-a+5b$
$\left(-7y-3\right)\left(-11+2y\right)$
$\left(3x\:-\:2\right)\:log\:\left(3\right)\:=\:log\:\left(81\right)$
$\frac{dy}{dx}=x^3-2x+1$
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