1-3=-1

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Solution for 1-3=-1 equation: 


Simplifying
1 + -3 = -1

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

Solving
-2 = -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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