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9=1+3m+m
We move all terms to the left:
9-(1+3m+m)=0
We add all the numbers together, and all the variables
-(4m+1)+9=0
We get rid of parentheses
-4m-1+9=0
We add all the numbers together, and all the variables
-4m+8=0
We move all terms containing m to the left, all other terms to the right
-4m=-8
m=-8/-4
m=+2
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