$3x^5-18x^3+27$
$n2+18n+81$
$16x^2-72x+81$
$\left(6^2\cdot2^2\cdot5^2\right)$
$4x^2-10x-3$
$\left(4a-2b-7c\right)+\left(5a-3b-7c\right)$
$\frac{x^{2n+4}}{2n+1}$
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