Posted by Job Daniel on Friday, April 20, 2012 at 2:13pm.
4/5*(-2/3) = -8/15
4/5* 1/2 = 4/10 = 2/5
1/7* 2/3 = 2/21
LCD = 3*5*7 = 105
-8/15 - 2/5 + 2/21 = -56/105 - 42/105 + 10/105 = -88/105
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