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How do you add a negative fraction and 2 postive fraction with diffrent denomenators

You first have to find a common denominator for all three fractions.

Then, add the two positive fractions and subtract the negative fraction.

Example:

1/2 - 3/4 + 5/6 = 6/12 - 9/12 + 10/12 = 7/12

ex; 6o/10 = 30/5

20/40=10/20

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