-5-7=18

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Solution for -5-7=18 equation: 


Simplifying
-5 + -7 = 18

Combine like terms: -5 + -7 = -12
-12 = 18

Solving
-12 = 18

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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