sum 1/5*(n+2)*(-4/5^n + (3*2^(2 + n))/5^n - (4*3^(1 + n))/5^n + 4^(1 + n)/5^n), n=0..infinitysum 1/5*(n+2)*(-4/5^n + (3*2^(2 + n))/5^n - (4*3^(1 + n))/5^n + 4^(1 + n)/5^n), n=0..infinity

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