log 16 64 - log 5 625- log9 81
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log 16 64- log 5 625 - log9 81
log 4² 4⁴ - log 5 5⁴ - log 9 9²
2log 4 4- 4 log 5 5 -2 log 9 9
2-4-2 =-4
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