-15-6=-6

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Solution for -15-6=-6 equation: 


Simplifying
-15 + -6 = -6

Combine like terms: -15 + -6 = -21
-21 = -6

Solving
-21 = -6

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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