6 log4 + 6 log9 6 log72 + 6 log1/2 3 log54 - 3 log2

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6 log4+6 log9
6 log(4x9)=6 log 36=2
6 log 72+6 log 1/2
6 log(72x1/2)=6 log 36=2
3 log 54-3 log 2
3 log(54:2)=3 log 27=3