$-9m+5m-8m+m$
$\frac{4x^4+8x^3+10x^2}{2x}$
$\left(2x+4\right)^2\left(2x-4\right)^2$
$x^{2+18x+9}$
$8x-5\left(16x^3-10x^2+7\right)$
$\left(1-\frac{x}{3}\right)^n$
$7\left(k+1\right)-2\left(k+1\right)$
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