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30=-b/0.2
We move all terms to the left:
30-(-b/0.2)=0
We get rid of parentheses
b/0.2+30=0
We multiply all the terms by the denominator
b+30*0.2=0
We add all the numbers together, and all the variables
b+6=0
We move all terms containing b to the left, all other terms to the right
b=-6
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