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\frac{a^{3}-b^{3}}{a^{2}+ab+b^{2}}
Since \frac{a^{3}}{a^{2}+ab+b^{2}} and \frac{b^{3}}{a^{2}+ab+b^{2}} have the same denominator, subtract them by subtracting their numerators.
\frac{\left(a-b\right)\left(a^{2}+ab+b^{2}\right)}{a^{2}+ab+b^{2}}
Factor the expressions that are not already factored in \frac{a^{3}-b^{3}}{a^{2}+ab+b^{2}}.
a-b
Cancel out a^{2}+ab+b^{2} in both numerator and denominator.