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For the denominator, multiply the denominators together.

For the numerator, subtract the second numerator multiplied by the first denominator from the first numerator multiplied by the second denominator:

a/b - p/q = (a x q - b x p)/b x q

eg:

6/7 - 3/4 = (6 x 4 - 7 x 3)/7 x 4

= (24 - 21)/28

= 3/28

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12y ago

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