Answer
$$2^u+4^uu$$
Work Step by Step
Expanding the expression by combining like terms where possible, we find:
$$ 2^uu\left(\frac{1}{u}+2^u\right) \\ 2^u\cdot \frac{1}{u}u+2^u\cdot \:2^uu \\ 2^u+4^uu$$
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