1) (27y - 9y) : 3= 18y : 3= 6y
2) (117m - 39n) : 13= 78m - 3n= 6m - 3n
3) (136a - 85b) : 17= 8a - 5b
4) (128c - 72d) : 8= 16c - 9d
1) (27y - 9y) : 3
= 18y : 3
= 6y
2) (117m - 39n) : 13
= 78m - 3n
= 6m - 3n
3) (136a - 85b) : 17
= 8a - 5b
4) (128c - 72d) : 8
= 16c - 9d