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27=b/0.8
We move all terms to the left:
27-(b/0.8)=0
We add all the numbers together, and all the variables
-(+b/0.8)+27=0
We get rid of parentheses
-b/0.8+27=0
We multiply all the terms by the denominator
-b+27*0.8=0
We add all the numbers together, and all the variables
-1b+21.6=0
We move all terms containing b to the left, all other terms to the right
-b=-21.6
b=-21.6/-1
b=21+0.6/1
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