9+[7-12]=

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Solution for 9+[7-12]= equation:


9+[7-12]=0

We simplify the equation to the form, which is simple to understand 
9+(7-12)=0

Remove unnecessary parentheses
+9-5=0

We move all terms containing  to the left and all other terms to the right. 
0=0-9+5

We simplify left and right side of the equation. 
0=-4

0=-4

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

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