12+9=10+21

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Solution for 12+9=10+21 equation: 


Simplifying
12 + 9 = 10 + 21

Combine like terms: 12 + 9 = 21
21 = 10 + 21

Combine like terms: 10 + 21 = 31
21 = 31

Solving
21 = 31

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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