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