0
Anonymous
-5.
The patterns seems to be "+9 +1 -20" repeat.
And, 15 - 20 = -5.
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-5
23
add 9 add 1 subtract 20 add 9 add 1
Assuming the pattern would continue: 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13...