-15-6=9-9

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


Simplifying
-15 + -6 = 9 + -9

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

Combine like terms: 9 + -9 = 0
-21 = 0

Solving
-21 = 0

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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