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42-9=m+9
We move all terms to the left:
42-9-(m+9)=0
We add all the numbers together, and all the variables
-(m+9)+33=0
We get rid of parentheses
-m-9+33=0
We add all the numbers together, and all the variables
-1m+24=0
We move all terms containing m to the left, all other terms to the right
-m=-24
m=-24/-1
m=+24
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