$-810-2\left[3-\left(6-7\right)\right]$
$\frac{x^{-1}+y^{-1}}{z^{-1}}$
$3\cdot\left(5\right)-7\cdot\left(-1\right)$
$17x+13+32-2x$
$x^2-32x+21$
$x^2-10x+22$
$\left(k-14\right)^2$
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