Answer
$$-5\cdot \:2^{\frac{1}{3}}$$
Work Step by Step
Simplifying the expression using the rules of exponents, we find:
$$ 5\cdot \:250^{\frac{1}{3}}-10\cdot \:54^{\frac{1}{3}} \\ 25\cdot \:2^{\frac{1}{3}}-30\cdot \:2^{\frac{1}{3}} \\ -5\cdot \:2^{\frac{1}{3}}$$