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

09-Addition and Subtraction of Fractions

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