-9+-12=

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Solution for -9+-12= equation: 


Simplifying
-9 + -12 = 0

Combine like terms: -9 + -12 = -21
-21 = 0

Solving
-21 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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