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1.3=3.9m
We move all terms to the left:
1.3-(3.9m)=0
We add all the numbers together, and all the variables
-(+3.9m)+1.3=0
We get rid of parentheses
-3.9m+1.3=0
We move all terms containing m to the left, all other terms to the right
-3.9m=-1.3
m=-1.3/-3.9
m=1/3
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