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13.5=m+12.1
We move all terms to the left:
13.5-(m+12.1)=0
We get rid of parentheses
-m-12.1+13.5=0
We add all the numbers together, and all the variables
-1m+1.4=0
We move all terms containing m to the left, all other terms to the right
-m=-1.4
m=-1.4/-1
m=1+0.4/1
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