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2013-03-30T14:11:54+01:00

A = (8/7 - 43/42) / 25/54

A= (8*6/7*6 - 43/42) / 25/54

A= (48/42 - 43/42) / 25/54

A= 5/42 / 25/54

A= 5/42 * 54/25

A= (270/ 1050)/10

A=27/105