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= (5'log 75 - 5'log 3) + (3'log 2 - 3'log 54)
= (5'log (75/3)) + (3'log (2/54))
= 5'log 25 + 3'log 1/27
= 5'log 5^2 + 3'log 3^-3
= 2 + (-3)
= -1
ingat!!
a'log a^n = n