12-[3+(-9)3]=

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Solution for 12-[3+(-9)3]= equation: 


Simplifying
12 + -1[3 + (-9) * 3] = 0

Multiply -9 * 3
12 + -1[3 + -27] = 0

Combine like terms: 3 + -27 = -24
12 + -1[-24] = 0

Multiply -1 * -24
12 + 24 = 0

Combine like terms: 12 + 24 = 36
36 = 0

Solving
36 = 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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