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b-18=3b-80
We move all terms to the left:
b-18-(3b-80)=0
We get rid of parentheses
b-3b+80-18=0
We add all the numbers together, and all the variables
-2b+62=0
We move all terms containing b to the left, all other terms to the right
-2b=-62
b=-62/-2
b=+31
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