`2/4 =`
`(2 -: 2)/(4 -: 2) = ` `1/2`
`6/9 =`
`(6 -: 3)/(9 -: 3)` `= 2/3`
`5/15 =`
`(5 -: 5)/(15 -: 5)` `=1/3`
`12/14 =`
`(12 -: 2)/(14 -: 2)` `= 6/7`
`27/63 =`
`(27 -: 9)/(63 -: 9)` `= 3/7`
`16/36 =`
`(16 -: 4)/(36 -: 4)` `= 4/9`
`42/54 =`
`(42 -: 6)/(54 -: 6)` `= 7/9`
`20/35 =`
`(20 -: 5)/(35 -: 5)` `= 4/7`