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A =  - 2/5 - 4 /5 = - 6 /5

B = 7/3 - 5 /12 =  28/12 - 5 /12 = 23 /12

C = 3/2 +  2/5 =  15/10 + 4/10 = 19/10

A =  13/12 + 7 /12 =  20 /12 = 5 /4

C =  4/7 + 2/3 =  12/21 + 14/21 = 26 /21

D = 1 /7 + 3 /14 - 2 /21  =   6 /42 + 9 /42 - 4 /42 =  11/42

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