$9x^3-25x^7$
$b^2-14b+49=0$
$2y^2+12y+18$
$\frac{2x}{x^4+8x^2+16}$
$-24\cdot\left(-11\right)$
$16x^2-16x-128$
$\left(a-b\right)\left(3c+d\right)$
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