9-10=21

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Solution for 9-10=21 equation: 


Simplifying
9 + -10 = 21

Combine like terms: 9 + -10 = -1
-1 = 21

Solving
-1 = 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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