Вычислите: 3/7+4/9, 8/9-78, 13/15-2/3, 20/21+3/7, 17/18-11/12, 7/16+1/6, 2/9+5/6, 10/21+9/14, 7/9-4/15, 9/14-3/7+15/28, 1/6+1/4-1/8, 13/18-29/45+8/15
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