Answer
0
Work Step by Step
div $\textbf{F}=\nabla \cdot \textbf{F}=\nabla\cdot\langle12x,-6y,-6z\rangle$
$=\frac{\partial}{\partial x}(12x)+\frac{\partial}{\partial y}(-6y)+\frac{\partial}{\partial z}(-6z)$
$=12+(-6)+(-6)=0$
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