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-9=-11+b/3
We move all terms to the left:
-9-(-11+b/3)=0
We add all the numbers together, and all the variables
-(b/3-11)-9=0
We get rid of parentheses
-b/3+11-9=0
We multiply all the terms by the denominator
-b+11*3-9*3=0
We add all the numbers together, and all the variables
-1b+6=0
We move all terms containing b to the left, all other terms to the right
-b=-6
b=-6/-1
b=+6
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