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-3m+1-9m=-11-9m
We move all terms to the left:
-3m+1-9m-(-11-9m)=0
We add all the numbers together, and all the variables
-3m-9m-(-9m-11)+1=0
We add all the numbers together, and all the variables
-12m-(-9m-11)+1=0
We get rid of parentheses
-12m+9m+11+1=0
We add all the numbers together, and all the variables
-3m+12=0
We move all terms containing m to the left, all other terms to the right
-3m=-12
m=-12/-3
m=+4
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