3[3]-12=18

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Solution for 3[3]-12=18 equation: 


Simplifying
3[3] + -12 = 18

Multiply 3 * 3
9 + -12 = 18

Combine like terms: 9 + -12 = -3
-3 = 18

Solving
-3 = 18

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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