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what you need to do is find the LCD (Least Common Denominator) of 9 and 12. there are a few ways to do this but you can Google those. LCD of 9 and 12 is 36 because 9 x 4 = 12 x 3

4/9 x 4 = 16/36 and 1/12 x 3 = 3/36

16/36 - 3/36 = 13/36

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14y ago
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