-3-12=12

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Solution for -3-12=12 equation: 


Simplifying
-3 + -12 = 12

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

Solving
-15 = 12

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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