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D = 1/2 + 2/3

D = (1 x 3) / (2 x 3) + (2 x 2) / (3 x 3)

D = 3/6 + 4/6

D = 7/6

E = - - 3/4 + - 1/5

E = 3/4 - 1/5

E = (3 x 5) / (4 x 5) - (1 x 4) / (5 x 4)

E = 15/20 - 4/20

E = 11/20

F = - 6/7 + 3

F = - 6/7 + (3 x 7) / (1 x 7)

F = - 6/7 + 21/7

F = 15/7

G = - 7/6 + - 5/4

G = (- 7 x 2) / (6 x 2) - (5 x 3) / (4 x 3)

G = - 14/12 - 15/12

G = - 29/12

H = 5 - 14/24

H = (5 x 12) / (1 x 12) - (2 x 7) / (2 x 12)

H = 60/12 - 7/12

H = 53/12.