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