$b^4-3b^6+2b^3x$
$-1\cdot2\cdot3$
$x^2+\frac{1}{3}x$
$x^2+18x-4=0$
$\frac{81a^6-144b^8}{9a^3+12b^4}$
$\left(3a^2b-5ab^5\right)^2$
$20x^3-605x=0$
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