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A = 5 x 2/3 - 1/3

A = 10/3 - 1/3

A = 9/3

A = (3 x 3) / (3 x 1)

A = 3

B = 7/4 - 3/4 x 3/2

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

B = 14/8 - 9/8

B = 5/8

C = (5/6 + 7/12) x 3/5

C =  [(5 x 2) / (6 x 2) + 7/12] x 3/5

C = (10/12 + 7/12) x 3/5

C = 17/12 x 3/5

C = 51/60

C = (3 x 17) / (3 x 20)

C = 17/20

D = 3/4 x 2/6 + 28/15 x 25/14

D = 6/24 + 700/210

D = 6/24 + (70 x 10) / (70 x 3)

D = 6/24 + 10/3

D = 6/24 + (10 x 8) / ( 3 x 8)

D = 6/24 + 80/24

D = 86/24

D = (2 x 43) / (2 x 12)

D = 43/12

E = (1/3 x 6/5 - 3/10) x 15/14

E = (6/15 - 3/10) x 15/14

E = [(6 x 2) / (15 x 2) - (3 x 3) / (10 x 3)] x 15/14

E = (12/30 - 9/30) x 15/14

E = 3/30 x 15/14

E = 45/420

E = (15 x 3) / (15 x 28)

E = 3/28

F = (8 + 2) / (7 + 2) x (3 x 6) / (5 x 3)

F = 10/14 x 18/15

F = 180/210

F = (30 x 6) / (30 x 7)

F = 6/7.