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Do you mean?

8/9 - 3/7

you will need a common denominator and an easy way is 9 * 7 = 63, then a form of one to maintain equality

7*8/7*9 - 9*3/9*7

56/63 - 27/63

= 29/63

--------------simplest form

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13y ago

What else can I help you with?