$15a-3ab+4b-20$
$-2\left(-6+5k\right)-1$
$\left(6x^3+7\right)\left(6x^3-7\right)$
$23\cdot16$
$\lim_{x\to60}\left(16x+5000\right)$
$\frac{d}{dx}xcosy=x^2+y^3$
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