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48=3b-12
We move all terms to the left:
48-(3b-12)=0
We get rid of parentheses
-3b+12+48=0
We add all the numbers together, and all the variables
-3b+60=0
We move all terms containing b to the left, all other terms to the right
-3b=-60
b=-60/-3
b=+20
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