Final answer:
The missing number in the sequence is 74.
Step-by-step explanation:
The missing number in the sequence 86, 82, 78, (x), 70, 66, 62 can be found by subtracting 4 from each number in the sequence. Starting from 86, when we subtract 4, we get 82. When we subtract 4 again, we get 78. Continuing this pattern, we will get the missing number, which is 74.
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