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2013-09-22T15:50:41+02:00
(2/5 -4/3) = 6/15 - 20/15 = -14/15 = -14/15 X 9/-35 =- 126/525 = -42/ 175 = -6/25 
-3 -8/9        -27/9 -8/9       - 35/9