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42=9b-18
We move all terms to the left:
42-(9b-18)=0
We get rid of parentheses
-9b+18+42=0
We add all the numbers together, and all the variables
-9b+60=0
We move all terms containing b to the left, all other terms to the right
-9b=-60
b=-60/-9
b=6+2/3
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