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-9-3m-m=8m-9
We move all terms to the left:
-9-3m-m-(8m-9)=0
We add all the numbers together, and all the variables
-4m-(8m-9)-9=0
We get rid of parentheses
-4m-8m+9-9=0
We add all the numbers together, and all the variables
-12m=0
m=0/-12
m=0
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