$-20-\left(-19\right)$
$\frac{\left(3x^5-2x+3\right)}{\left(2+x^3\right)}$
$\lim_{x\to-1}\left(\frac{x+1}{x^2+3x-4}\right)$
$y'\:+\:2xy\:=\:2e^{-x^2}$
$x\left(-2\right)\left(-x-4\right)$
$4\:+\:\left(-15\right)\:-\:21$
$\left(x^3-6x^4+8x-9+15x\right)\left(25x+25x^3-18x^2-11x^5-46\right)$
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