5^n+2-5^n/5^n+1+5^n-18*5^n-1
5^n+2-5^n/5^n+1+5^n-18*5^n-1 = -1/8*5^n
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5^n+2-5^n/5^n+1+5^n-18*5^n-1 = -1/8*5^n