(3/5+1/15- 6/10) :a =1/39
1/15 : a = 1/39
a = 1/15 : 1/39
a = 13/5
(3/5+1/15- 6/10) :a =1/39
(9/15+1/15- 6/10) :a =1/39
(10/15- 6/10) :a =1/39
(10/15 -3/5) :a =1/39
(10/15 - 9/15) :a =1/39
1/15 : a=1/39
a=1/15 : 1/39
a=1/15 x 39
a=39/15
`(3/5+1/15- 6/10) :a =1/39`
` ( 18/30 + 2/30 - 18/30) : a = 1/39`
` 2/30 : a = 1/39`
` 1/15 : a = 1/39`
` a = 1/15 : 1/39`
`a = 1/15 xx 39`
` a = 13/5`