'Let `a , b , c , d` be positive integers such that `(log)_a b=3/2a n d(log)_c d=5/4dot` If `(a-c)=9

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"Let `a , b , c , d` be positive integers such that `(log)_a b=3/2a n d(log)_c d=5/4dot` If `(a-c)=9,` then find the value of `(b-d)dot`"
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