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120=2+1+m
We move all terms to the left:
120-(2+1+m)=0
We add all the numbers together, and all the variables
-(m+3)+120=0
We get rid of parentheses
-m-3+120=0
We add all the numbers together, and all the variables
-1m+117=0
We move all terms containing m to the left, all other terms to the right
-m=-117
m=-117/-1
m=+117
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