7 2n 5 )= 8 4n 1 )- 9 July 8, 2019 16 32 64 128 7 - 2n = 8n - (-4n) 7 - 2n = 8n - (-4n) then n = (7 ^ (n + 1) - 7 ^ (n - 1))/(8 * 7 ^ n)
