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9m-3m-m=5m-12
We move all terms to the left:
9m-3m-m-(5m-12)=0
We add all the numbers together, and all the variables
5m-(5m-12)=0
We get rid of parentheses
5m-5m+12=0
We add all the numbers together, and all the variables
12!=0
There is no solution for this equation
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