15+9-6=-21

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Solution for 15+9-6=-21 equation: 


Simplifying
15 + 9 + -6 = -21

Combine like terms: 15 + 9 = 24
24 + -6 = -21

Combine like terms: 24 + -6 = 18
18 = -21

Solving
18 = -21

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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