Ain't quite figured this one out ...Yet!!

To help figure it out, think about the significance of the number 9. If this isn't enough of a hint, look at the symbol for all the multiples of 9.



Edit: corrected spelling.
 
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thing didnt guess my number the first time!

second time it did lol

but seriously. if someone things this thing is actually reading your mind.. umm.. :p:
 
It's set up so all possible answers have the same symbol, and it looks like all tens give the same answer, ie. 99 is 9+9=18, 99-18=81, and 96 is 9+6=15, 96-15=81 too, so the answer for all the 90s will be 81. Plant the symbol on 81. For the 60s it would be 54. All multiples of 9 as pointed out earlier.

The symbols chart changes for iteration, but the chart plants the symbols for that iteration on all possible answers.
 
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