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18=b/3+15
We move all terms to the left:
18-(b/3+15)=0
We get rid of parentheses
-b/3-15+18=0
We multiply all the terms by the denominator
-b-15*3+18*3=0
We add all the numbers together, and all the variables
-1b+9=0
We move all terms containing b to the left, all other terms to the right
-b=-9
b=-9/-1
b=+9
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