$-6-3-\left(-8\right)+\left(-5\right)-17$
$2xy-y-x-x$
$\lim_{x\to2}\left(3ti+\frac{2}{t^2-1}j+\frac{1}{t}k\right)$
$\left(7x+2\right)^3$
$\left[\left(5-3\right)+\left(4-1\right)^2\right]$
$\sqrt[5]{25^{4x+1}}=\sqrt[4]{125^{2x+2}}$
$91^3$
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