$\text { If }\left|\begin{array}{lll}a & b & c \\d & e & f \\g & h & i\end{array}\right|$ $=-6 \text { then }$ $\left|\begin{array}{ccc}3 a & 3 b & 3 c \\-d & -e & -f \\4 g & 4 h & 4 i\end{array}\right|$ $=\text { ? }$

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