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