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2014-10-09T09:20:33+02:00
D = 3 - 140/105 = 315/105 -140/105 = 175/105 = 5/3

E = ( 6/21 - 7/21) x ( - 35/16)

E = -1/21 x - 35/16 = 35/336 = 5/48