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(125/8)^5 × (125/8)^x = (5/2)^18
=> (5^3/2^3)^5 × (5^3/2^3)^x = (5/2)^18
=> (5/2)^15 × (5/2)^3x = (5/2)^18
=> (15 + 3x) = 18
=> 3x = 3
=> x = 1
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