You could go for add 9, add 1 divide by 5
or
you could have the polynomial
(-30x5 + 513x4 - 3232x3 + 9171x2 - 11438x + 5376)/24
and according to that, the next number is -266
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The answer is 35.
The next number after 15 will be 3. You are sequentially adding 9, adding 1, and dividing by 5.
3
35
-5