The missing number is 66.

The pattern seems to be subtracting 10 from each number and then adding 4, except for the last number where we subtract 74 instead of 10.

73 - 10 + 4 = 67 87 - 10 + 4 = 81 98 - 10 + 4 = 92 77 - 10 + 4 = 71 66 - 74 + 4 = -4 -4 - 10 + 4 = -10 (which is equivalent to 3 when counting backwards from -4)

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