$4x^2+8x-3=0$
$5x^2-70x+245$
$3x+8\le x+20$
$\frac{x-9}{6x-x^2}$
$6z^2m-12zm^3$
$\frac{3b^6}{b^6}$
$x^5+x^2-x-1$
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