$x^3-7x^2+14x-6$
$20ab-25bm-15bx+40by$
$\frac{2x^2+4x^2+2x}{6x^3-6x}$
$x2+14x+45<0$
$-5ab+12ab-ab$
$6x^2+7x+1$
$-4^2+-2^3$
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