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8b-42=4b-6
We move all terms to the left:
8b-42-(4b-6)=0
We get rid of parentheses
8b-4b+6-42=0
We add all the numbers together, and all the variables
4b-36=0
We move all terms containing b to the left, all other terms to the right
4b=36
b=36/4
b=9
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