The difference between a number x and twice y is equal to fifteen.
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There is no difference in value between "equal" fractions: the difference is zero.
There is no difference because they are of equal value
The difference between one number and the next in the sequence is decreasing by 9 each time. Therefore, the difference between -4 and the next number will be equal to 62 - 9 = 53. The next number is therefore equal to -4 - 53 = -57.
The differences between the pairs of numbers up to that point are 31, 32, 33, 34. If the difference between the fifth number and the sixth number is equal to 35, that would make the next number equal to 122 + 243 = 265.
There appears to be a number missing in the sequence - as the difference of the differences is equal to 12 each time, apart from between 221 and 323, where the difference is 24.