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0.9=0.4m
We move all terms to the left:
0.9-(0.4m)=0
We add all the numbers together, and all the variables
-(+0.4m)+0.9=0
We get rid of parentheses
-0.4m+0.9=0
We move all terms containing m to the left, all other terms to the right
-0.4m=-0.9
m=-0.9/-0.4
m=2+0.1/0.4
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