simplify 6/7c - 5/9d - 1/2c + 1/3d

5/14c - 2/9d
5 / 14 C + 2/9d
5/9c - 4/12 D equals 5/9c - 1/3 D
5/9c + 4 / 120d = 5/9c + 1/3 d

The simplified expression is 5/14c - 2/9d.