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15=b/3+12
We move all terms to the left:
15-(b/3+12)=0
We get rid of parentheses
-b/3-12+15=0
We multiply all the terms by the denominator
-b-12*3+15*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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