-31=-7+4

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Solution for -31=-7+4 equation: 


Simplifying
-31 = -7 + 4

Combine like terms: -7 + 4 = -3
-31 = -3

Solving
-31 = -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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