-3+15=21

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Solution for -3+15=21 equation: 


Simplifying
-3 + 15 = 21

Combine like terms: -3 + 15 = 12
12 = 21

Solving
12 = 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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