[(-21)+(-9)]+12=

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Solution for [(-21)+(-9)]+12= equation: 


Simplifying
[(-21) + (-9)] + 12 = 0
[-21 + (-9)] + 12 = 0
[-21 + -9] + 12 = 0

Combine like terms: -21 + -9 = -30
[-30] + 12 = 0
-30 + 12 = 0

Combine like terms: -30 + 12 = -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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