-6+9=21

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Solution for -6+9=21 equation: 


Simplifying
-6 + 9 = 21

Combine like terms: -6 + 9 = 3
3 = 21

Solving
3 = 21

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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