Factor the difference of cubes: $a^3-b^3 = (a-b)(a^2+ab+b^2)$
Simplify $\sqrt[3]{\left(d^3\right)^{2}}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $3$ and $n$ equals $\frac{2}{3}$
Multiply the fraction and term in $3\cdot \left(\frac{2}{3}\right)$
Multiply $3$ times $2$
Divide $6$ by $3$
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