$3x+5<x+7\:\:\:\:\:\:$
$\frac{-4x^{-2}}{y^{-3}}$
$\left(4x-1\right)^2-\left(3x+1\right)^2$
$\frac{1}{x^2}-\frac{1}{x\cdot y}$
$\left(3m-\frac{2}{5}n\right)^2$
$5x^2y-12x^2\:y$
$\left(9^6\right)\left(9^2\right)^{-3}$
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