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-11=b/3-15
We move all terms to the left:
-11-(b/3-15)=0
We get rid of parentheses
-b/3+15-11=0
We multiply all the terms by the denominator
-b+15*3-11*3=0
We add all the numbers together, and all the variables
-1b+12=0
We move all terms containing b to the left, all other terms to the right
-b=-12
b=-12/-1
b=+12
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