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-9m=-9-8m
We move all terms to the left:
-9m-(-9-8m)=0
We add all the numbers together, and all the variables
-9m-(-8m-9)=0
We get rid of parentheses
-9m+8m+9=0
We add all the numbers together, and all the variables
-1m+9=0
We move all terms containing m to the left, all other terms to the right
-m=-9
m=-9/-1
m=+9
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