12-11-10-9=

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Solution for 12-11-10-9= equation: 


Simplifying
12 + -11 + -10 + -9 = 0

Combine like terms: 12 + -11 = 1
1 + -10 + -9 = 0

Combine like terms: 1 + -10 = -9
-9 + -9 = 0

Combine like terms: -9 + -9 = -18
-18 = 0

Solving
-18 = 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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