7 X 5/6 + 7 X 1/6 3/5 X 7/9 - 3/5 X 2/9 5/9 X 1/4 + 9 X 3/12

4/7 x 5/6 + 4/7 x 1/6 3/5 x 7/9 - 3/5 x 2/9 5/9 x 1/4 + 4/9 x 3/12