$12mn-23mn-5mn$
$3^2+2^{3\:}+-4^2$
$36s^2+84s+49$
$6x-mx=2+m$
$\left(\frac{2a\:+\:\sqrt{2x}}{2a\:-\:\sqrt{2x}}\right)^2$
$\left(\:x\:-\:4\right)^3$
$2\left(3x+4\right)\ge4\left(3x+2\right)$
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