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The lowest common denominator is 1/4 x 1/9 = 1/36. 1/4 = 36/4x1 x 1/36 = 9/36 7/9 = 36/9x7 x 1/36 = 28/36 28/36 - 9/36 = 21/36 = 7/12

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16y ago

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