-4+5=7

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Solution for -4+5=7 equation: 


Simplifying
-4 + 5 = 7

Combine like terms: -4 + 5 = 1
1 = 7

Solving
1 = 7

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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