$\sqrt{9-x}=2$
$7x-21y$
$y'=\frac{x}{e^y}$
$\left(3x+8\right)-6\left(2.5x-3\right)$
$\left[-2+\left[-3\right]\right]-\left[5-\left[-4\right]\right]$
$6\sqrt[2]{3}-\sqrt[2]{3}+4\sqrt[2]{3}$
$\lim_{x\to0}\left(\frac{e^{3x}-sin\left(3x\right)-1}{x\cdot sin\left(5x\right)+6x}\right)$
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