-13+7=4

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Solution for -13+7=4 equation: 


Simplifying
-13 + 7 = 4

Combine like terms: -13 + 7 = -6
-6 = 4

Solving
-6 = 4

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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