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9=1+m+3
We move all terms to the left:
9-(1+m+3)=0
We add all the numbers together, and all the variables
-(m+4)+9=0
We get rid of parentheses
-m-4+9=0
We add all the numbers together, and all the variables
-1m+5=0
We move all terms containing m to the left, all other terms to the right
-m=-5
m=-5/-1
m=+5
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