`(5 . 4^15 . 9^9 - 4 . 3^20 . 8^9)/(5 . 2^9 . 6^19 - 7 . 2^29 . 27^6)`
`= (5 . 2^30 . 3^18 - 2^2 . 3^20 . 2^27)/(5 . 2^9 . 2^19 . 3^19 - 7. 2^29 . 3^18)`
`= (5 . 2 . 2^29 . 3^18 - 3^2 . 3^18 . 2^29)/(5 . 2^28 . 3^18 . 3 - 7 . 2^28 . 2 . 3^18)`
`= (2^29 . 3^18 (5 . 2 - 3^2))/(2^28 . 3^18 . (5 . 3 - 7 . 2))`
`= (2 . (10 - 9))/(15 - 14)`
`= (2 . 1)/1`
`= 2`