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The answers are all multiples of 9. So, if your number is 16 then you subtract 7 and get 9. If your number is 25 you subtract 7 and get 18 (9x2). If your number is 39 you subtract 12 and get 27 (9x3) etc. This works all the way up and you'll see every multiple of 9 has the same symbol.
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