$\frac{125}{8}x^3+27$
$6xy+3x-4xy-3x+9x+xy-20y$
$\frac{dy}{dx}\left(y\:=\:ln\:\left(e^{-x}+\:xe^{-x}\right)\right)$
$\left(3cd-5az\right)^2$
$4+3x>16$
$z\left(x^2y-z^2+xyz\right)$
$\lim_{x\to-1}\frac{x^2+1}{x^2-1}$
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