-1-2=3

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Solution for -1-2=3 equation: 


Simplifying
-1 + -2 = 3

Combine like terms: -1 + -2 = -3
-3 = 3

Solving
-3 = 3

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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