$e^x\cdot x-e^x$
$\lim_{x\to0}\left(\frac{\frac{1}{\left(1+x\right)}-1}{x}\right)$
$-3\cdot4-2\cdot5+2\cdot3$
$\left(6^8\right)^9$
$3x+6y-9z$
$\frac{5dy}{dx}-15x^2=0$
$11-\left(12-8\right)+2$
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