18 /85 + 6 5/63 - 7/18 =

9 2/5 + 3/8 - 4 3/20=

3 5/12 + 9 1/6 - 5 1/18=

5 2/3 + 11 7/12 - 4 3/4=

10 1/12 + 2 5/36 -2 7/72=