-21+9=

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Solution for -21+9= equation: 


Simplifying
-21 + 9 = 0

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

Solving
-12 = 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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