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0.4-0.2=b-0.2b
We move all terms to the left:
0.4-0.2-(b-0.2b)=0
We add all the numbers together, and all the variables
-(+0.8b)+0.4-0.2=0
We add all the numbers together, and all the variables
-(+0.8b)+0.2=0
We get rid of parentheses
-0.8b+0.2=0
We move all terms containing b to the left, all other terms to the right
-0.8b=-0.2
b=-0.2/-0.8
b=0.2/0.8
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