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- 2 + 1 7/8 = - ( 2 - 1 7/8) = - 1/8
- 1 + 2 1/9 = 2 1/9 - 1 = 1 1/9
- 4 + 3 1/2 =- (4 - 3 1/2) = - 1/2
-5/7 + 4/7 = - (5/7 - 4/7) = - 1/7
-5/8 + 7/8 = 7/8 - 5/8 = 2/8 = 1/4
-1/6 + 1 = 1 - 1/6 = 5/6
5/12 - 1/12 = 4/12 = 1/3
7/15 - 11/15 = - (11-7)/15 = - 4/15
5/16 - 1/6 = 15/48 - 8/48 = 7/48
- 1 + 2 1/9 = 2 1/9 - 1 = 1 1/9
- 4 + 3 1/2 =- (4 - 3 1/2) = - 1/2
-5/7 + 4/7 = - (5/7 - 4/7) = - 1/7
-5/8 + 7/8 = 7/8 - 5/8 = 2/8 = 1/4
-1/6 + 1 = 1 - 1/6 = 5/6
5/12 - 1/12 = 4/12 = 1/3
7/15 - 11/15 = - (11-7)/15 = - 4/15
5/16 - 1/6 = 15/48 - 8/48 = 7/48
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