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36=3b-9
We move all terms to the left:
36-(3b-9)=0
We get rid of parentheses
-3b+9+36=0
We add all the numbers together, and all the variables
-3b+45=0
We move all terms containing b to the left, all other terms to the right
-3b=-45
b=-45/-3
b=+15
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