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= 5^(-4n - 12)/6
= 5^(-2n/3) . 5⁻²
= (1/25) 5^(-2n/3)
((a⁻¹ - b⁻¹)/(a⁻¹ + b⁻¹))¹
= (a⁻¹ + b⁻¹)/(a⁻¹ - b⁻¹)
= (1/a + 1/b) / (1/a - 1/b)
= ((a + b)/ab)) / ((b - a)/ab))
= (a + b) / (b - a)