12-[3+(-9)4]=

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Solution for 12-[3+(-9)4]= equation: 


Simplifying
12 + -1[3 + (-9) * 4] = 0

Multiply -9 * 4
12 + -1[3 + -36] = 0

Combine like terms: 3 + -36 = -33
12 + -1[-33] = 0

Multiply -1 * -33
12 + 33 = 0

Combine like terms: 12 + 33 = 45
45 = 0

Solving
45 = 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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