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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.
5/7 + 9 = 5/7 + 63/7 = 68/7
6 plus 6 plus 63 plus 63 plus 36 plus 36 is equal to 210.
50 + 63 + 72 + 63 + 137 + 172 = 557
145 plus 68 is equal to 213.