-9-(-9)=

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Solution for -9-(-9)= equation: 


Simplifying
-9 + -1(-9) = 0

Multiply -1 * -9
-9 + 9 = 0

Combine like terms: -9 + 9 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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