`{5 1/3 + 2/5}/{3/15 + 1/4 + 7/20 . 17/49}`
`= {16/3 + 2/5}/{3/15 + 1/4 + 17/140}`
`= {86/15}/{9/20 + 17/140}`
`= {86/15}/{4/7}`
`= 86/15 : 4/7`
`= 86/15 . 7/4`
`= 301/30`
____________________
`{3/15 + 1/4 + 7/20 . 17/49}/{5 1/3 + 2/5}`
`= {3/15 + 1/4 + 17/140}/{5 1/3 + 2/5}`
`= {9/20 + 17/140}/{86/15}`
`= {4/7}/{86/15}`
`= 4/7 : 86/15`
`= 4/7 . 15/86`
`= 30/301`
