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3+3b=-3b+15
We move all terms to the left:
3+3b-(-3b+15)=0
We get rid of parentheses
3b+3b-15+3=0
We add all the numbers together, and all the variables
6b-12=0
We move all terms containing b to the left, all other terms to the right
6b=12
b=12/6
b=2
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