-(5+12)=18

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Solution for -(5+12)=18 equation: 


Simplifying
-1(5 + 12) = 18

Combine like terms: 5 + 12 = 17
-1(17) = 18

Multiply -1 * 17
-17 = 18

Solving
-17 = 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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