$\left(x^2+3x+2\right)\left(2x-1\right)$
$15n+45$
$\left(3n^4+2n\right)^2$
$\left(\frac{n^2-5n+6}{2n+4}\right)\frac{n+2}{2n^2-12n+18}$
$x^2+20x-9$
$x^4-3x^3+x^2+3x-2$
$20m+45$
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