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8b=4b-18
We move all terms to the left:
8b-(4b-18)=0
We get rid of parentheses
8b-4b+18=0
We add all the numbers together, and all the variables
4b+18=0
We move all terms containing b to the left, all other terms to the right
4b=-18
b=-18/4
b=-4+1/2
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