If the sequence is determined by 100 - 70 = 30, then the next number is 10.
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The next number in the sequence 3-15-6-30-21 is -207.
10
92 - 18 = 72 72 - 16 = 56 56 - 14 = 42 42 - 12 = 30 30 - 10 = 20 20 is the next number in the sequence.
121498
35