3/9 + 2/9 - 5/9, 4/6 + 1/6 - 5/6, 1/5 + 3/5 - 4/5, 3/12 + 4/12 - 7/12, 1/5 + 2/5 - 3/5, 5/10 + 2/10 - 7/10, 2/7 + 2/7 - 4/7, 6/11 + 3/11 - 9/11, 2/8 + 5/8 - 7/8, 2/10 + 6/10 - 8/10,

Adding Fractions with Like Denominators

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