$\left(9m-n\right)\left(9m+n\right)$
$\frac{\left(4x^2-\:9m^2\right)}{2x\:-\:3m}$
$7x+5\le9x-3$
$150mx-3nx+21xy$
$x^2-x-36=6$
$3x-3>x+5$
$27\cdot27\cdot27$
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