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6.5=m+3.1
We move all terms to the left:
6.5-(m+3.1)=0
We get rid of parentheses
-m-3.1+6.5=0
We add all the numbers together, and all the variables
-1m+3.4=0
We move all terms containing m to the left, all other terms to the right
-m=-3.4
m=-3.4/-1
m=3+0.4/1
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