$\lim_{x\to0}\left(-\frac{e^{6x}-6x-1}{x}\right)$
$16m^4n^3u^2-20m^3n^2u^2-36m^2n^2u$
$\int\frac{1}{x\sqrt{7}\tan\left(30\right)}dx$
$\frac{4+\sqrt{-4}}{2}$
$\left(-x+5\right)\left(9x\right)$
$z+55=70$
$2xy'+y=2x$
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