9-12=1

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Solution for 9-12=1 equation: 


Simplifying
9 + -12 = 1

Combine like terms: 9 + -12 = -3
-3 = 1

Solving
-3 = 1

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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