$4x^2-13x+9=0$
$\left(x^3+2x^2-x\right)\left(x^2-2x+5\right)$
$4x+7\le2x-7$
$\frac{9}{16}a^4-\frac{1}{25}^2$
$12am+6a^2m$
$\left(b^3\cdot b^5\right)$
$\left(\frac{3}{4}m-n^2\right)\left(\frac{3}{4}m+n^2\right)$
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