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54=b+15.2
We move all terms to the left:
54-(b+15.2)=0
We get rid of parentheses
-b-15.2+54=0
We add all the numbers together, and all the variables
-1b+38.8=0
We move all terms containing b to the left, all other terms to the right
-b=-38.8
b=-38.8/-1
b=38+0.8/1
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