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-112.5=3.75b
We move all terms to the left:
-112.5-(3.75b)=0
We add all the numbers together, and all the variables
-(+3.75b)-112.5=0
We get rid of parentheses
-3.75b-112.5=0
We move all terms containing b to the left, all other terms to the right
-3.75b=112.5
b=112.5/-3.75
b=-30
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