3-4=40

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Solution for 3-4=40 equation: 


Simplifying
3 + -4 = 40

Combine like terms: 3 + -4 = -1
-1 = 40

Solving
-1 = 40

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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