6 4/9-2 5/6+12 1/6=15 7/9
1)6 4/9-2 5/6=58/9-17/6=2*58-3*17/18=65/18=3 11/18
2)3 11/18+12 1/6=65/18+73/6=65+3*73/18=284/18=15 7/9
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6 4/9-2 5/6+12 1/6=15 7/9
1)6 4/9-2 5/6=58/9-17/6=2*58-3*17/18=65/18=3 11/18
2)3 11/18+12 1/6=65/18+73/6=65+3*73/18=284/18=15 7/9