Simple operation of 5 / 6 * 1 / 13 + 5 / 9 * 2 / 13 + 5 / 18 * 6 / 13

5/6*1/13+5/9*2/13+5/18*6/13
=15/18*1/13+10/18*2/13+5/18*6/13
=(15+20+30)/18*13
=5/18

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