$3x-7y=7y-3x$
$-11+8^2$
$7k^2-23k+6$
$\frac{z^7y^3}{z^6y}$
$2\cdot\left[3-\left\{5-2\cdot\left(7-10\right)-1\right\}+5\right]$
$\left(a+8\right)\left(a-6\right)-\left(2a-7\right)^2$
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