42/46 and 63/69 are equivalent to 21/23.
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two fractions are equivalent 21 over 23 = 42/46, 63/69
They are: 14/46 and 28/92
2 equivalent fractions for 15 and 23 = 30/46, 45/69
The fraction 21/23 cannot be simplified. You could muliply both of them by the same number, and get a fraction like 42/46, but it's better to keep fractions simplified.
equivalent fraction for 21 over 23 = 42/46