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