# ((m ^ (1/3) n ^ (1/2)) ^ - 6 (m ^ (1/5) n ^ (1/8)) ^ - 20) / (m ^ (1/3) n) #
# = ((m ^ (- 1 / 3xx6) n ^ (- 1 / 2xx6)) (m ^ (- 1 / 5xx20)) n ^ (- 1 / 8xx20)) / (m ^ (1/3) n) #
# = ((m ^ (- 2) n ^ (- 3)) (m ^ (- 4) n ^ (- 5/2))) / (m ^ (1/3) n) #
# = 1 / (m ^ 2 n ^ 3m ^ 4 n ^ (5/2) m ^ (1/3) n) #
# = 1 / (m ^ (2 + 4 + 1/3) n ^ (3 + 5/2 + 1)) #
# = 1 / (m ^ (18/3) n ^ (13/2)) #