Answer
$$g=3,\:g=-2,\:g=2$$
Work Step by Step
Solving the equation, we find:
$$ g^3-3g^2-4g+12=0 \\ \left(g-3\right)\left(g+2\right)\left(g-2\right)=0 \\ g=3,\:g=-2,\:g=2$$
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