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10=3b+12.5
We move all terms to the left:
10-(3b+12.5)=0
We get rid of parentheses
-3b-12.5+10=0
We add all the numbers together, and all the variables
-3b-2.5=0
We move all terms containing b to the left, all other terms to the right
-3b=2.5
b=2.5/-3
b=-2.5/3
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