-21=-9+6

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Solution for -21=-9+6 equation: 


Simplifying
-21 = -9 + 6

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

Solving
-21 = -3

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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