$7m^2n^3\:x\:3m^2n^3$
$-\frac{1}{2}z^{-2}\:\cdot\:yz^6\cdot\frac{3}{5}zy^3\cdot y^{-3}z^{-2}$
$36\cdot27$
$722+926$
$\frac{1-x}{x}\le2$
$x+1,\:9-x^2$
$9^{-4}\cdot9^{-4}\cdot9^6$
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