4 - 6 = -2 so equivalent fractions are any fractions of the form (-2*x)/x where x is a non-zero integer.
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2 equivalent fractions for 15 and 23 = 30/46, 45/69
two fractions are equivalent 21 over 23 = 42/46, 63/69
42/46 and 63/69 are equivalent to 21/23.
They are: 23/10, 46/20 and 69/30
They are: 14/46 and 28/92