[-1-(-9-4)]=

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Solution for [-1-(-9-4)]= equation: 


Simplifying
[-1 + -1(-9 + -4)] = 0

Combine like terms: -9 + -4 = -13
[-1 + -1(-13)] = 0

Multiply -1 * -13
[-1 + 13] = 0

Combine like terms: -1 + 13 = 12
[12] = 0
12 = 0

Solving
12 = 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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