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= 4 . 3'log 81 + 5 . 3'log 9
= 4. 3'log 3^4 + 5. 3'log 3^2
= 4. 4.(3'log3) + 5 . 2. (3'log 3)
= 4(4) + 5(2)
= 16 - 10
= 6