$16a^2+72a-81$
$5x^2+9x-7+-8x^2+10x+15$
$x^2-2x-6$
$=8x^3\left(7x^6-3x^5\right)$
$\frac{\left(x^4+8^1x^2+8\right)}{x^3-4x}$
$x^2-16x-63=0$
$\left(-x^3\right)\cdot\left(2x^3+3x-1\right)$
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