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= -1/3 [2/5-1/2(5/15-3/15)]
=-1/3 [ 2/5-1/2 (2/15)]
=-1/3 [ 2/5- 2/30]
= -1/3 [12/30 - 2/30]
= -1/3 [10/30]
=-10/90
=-1/9