[5+7]=-15

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Solution for [5+7]=-15 equation: 


Simplifying
[5 + 7] = -15

Combine like terms: 5 + 7 = 12
[12] = -15
12 = -15

Solving
12 = -15

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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