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2/3 + 4/5 + 6/7 + 1/9= 6/9 + 4/5 + 6/7 + 1/9
= 7/9 + 4/5 + 6/7
= 7/9 + 28/35 + 30/35
= 7/9 + 58/35
= 245/315 + 522/315
= 767/315
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