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