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The two denominators (9 and 7) have no common factors besides 1, so the least common denominator is their product, 63. So we have 4/9 is 28/63, and 5/7 is 45/63. The numerators add up to 68, so we get 68/63, which is 1 5/63, which is already in lowest terms.

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Q: What is four ninths plus five sevenths?
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