(-12)+(-9)=

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Solution for (-12)+(-9)= equation: 


Simplifying
(-12) + (-9) = 0
-12 + (-9) = 0
-12 + -9 = 0

Combine like terms: -12 + -9 = -21
-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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