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\frac{27m^{3}-1}{27}
Factor out \frac{1}{27}.
\left(3m-1\right)\left(9m^{2}+3m+1\right)
Consider 27m^{3}-1. Rewrite 27m^{3}-1 as \left(3m\right)^{3}-1^{3}. The difference of cubes can be factored using the rule: a^{3}-b^{3}=\left(a-b\right)\left(a^{2}+ab+b^{2}\right).
\frac{\left(3m-1\right)\left(9m^{2}+3m+1\right)}{27}
Rewrite the complete factored expression. Polynomial 9m^{2}+3m+1 is not factored since it does not have any rational roots.