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5b=2b-9
We move all terms to the left:
5b-(2b-9)=0
We get rid of parentheses
5b-2b+9=0
We add all the numbers together, and all the variables
3b+9=0
We move all terms containing b to the left, all other terms to the right
3b=-9
b=-9/3
b=-3
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