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49/18 * 4/21 * 9/7= 14/27* 9/7= 2/3
2 4/5 - 1 1/5 *2/3+5 1/15 = 2 4/5 - 2/15+ 5 1/15 = 2 12/15 -2/15+ 5 1/15 =2 10/15 + 5 1/15 = 7 11/15