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(2*3^(n+1) + 7*3^(n-1) )/(3^(n+2) - 2*3^(n-1) )
=> 3^(n-1) * (2*3² + 7)/3^(n-1) * (3³ - 2)
=> (2*9 + 7)/(9-2)
=> (25)/(7)
= 25/7
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