Answer
$\color{blue}{4a^{-7/5}(a+4)}$
Work Step by Step
The least exponent of the variable is $-7/5$.
The numerical coefficients have a greatest common factor of $4$.
Factor out $4a^{-7/5}$ to obtain:
$=\color{blue}{4a^{-7/5}(a+4)}$
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