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In normal mathemtics, there is only one number equal to -9 and that is -9. This number can be expressed or written in several ways:

-900%, -9.000, -8.999... (repeated infinitely many times), -9/1, -18/2, etc.

In modular arithmetic, however, things are different. Here it is the non-negative remainder when the number is divided by the base. So, for example,

-9 (mod 10) = +1

-9 (mod 11) = +2

-9 mod 3) = 0

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Q: What number is equal to -9?
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