3(-2+2)=12

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Solution for 3(-2+2)=12 equation: 


Simplifying
3(-2 + 2) = 12

Combine like terms: -2 + 2 = 0
3(0) = 12

Multiply 3 * 0
0 = 12

Anything times zero is zero.
0 = 12

Solving
0 = 12

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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