-15+-6=-9

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Solution for -15+-6=-9 equation: 


Simplifying
-15 + -6 = -9

Combine like terms: -15 + -6 = -21
-21 = -9

Solving
-21 = -9

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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