12+-3=21

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Solution for 12+-3=21 equation:


12+-3=21

We simplify the equation to the form, which is simple to understand 
12+-3=21

We move all terms containing  to the left and all other terms to the right. 
0=+21-12

We simplify left and right side of the equation. 
0=+9

0=9

The left and right sides are not equal, therefore there is no solution. This equation is invalid.

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