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A = -9/5 + 7/5

A = -2/5

b = -2,62/27 - 14,5/27

B = -17,12/27

B = -1712/2700

B = -(4 x 428)/(675 x 4)

B = -428/675

c = 12/25 - (-17/25) - 133/25

C = 12/25 + 17/25 - 133/25

C = 29/25 - 133/25

C = 104/25

d = 4,5 - 7/8

D = 45/10 - 7/8

D = (9 x 5)/(2 x 5) - 7/8

D = 9/2 - 7/8

D = (9 x 4)/(2 x 4) - 7/8

D = 36/8 - 7/8

D = 29/8

e = -5 - 6/5

E = -25/5 - 6/5

E = -31/5

F = -5/21 - 7/3

F = -5/21 - (7 x 7)/(3 x 7)

F = -5/21 - 49/21

F = -54/21

F = (-3 x 18)/(3 x 7)

F = -18/7

G = -2/7 + 3/14

G = (-2 x 2)/(7 x 2) + 3/14

G = -4/14 + 3/14

G = -1/14