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127.5=4.25b
We move all terms to the left:
127.5-(4.25b)=0
We add all the numbers together, and all the variables
-(+4.25b)+127.5=0
We get rid of parentheses
-4.25b+127.5=0
We move all terms containing b to the left, all other terms to the right
-4.25b=-127.5
b=-127.5/-4.25
b=+30
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