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-(b+4)+4b=b-18
We move all terms to the left:
-(b+4)+4b-(b-18)=0
We add all the numbers together, and all the variables
4b-(b+4)-(b-18)=0
We get rid of parentheses
4b-b-b-4+18=0
We add all the numbers together, and all the variables
2b+14=0
We move all terms containing b to the left, all other terms to the right
2b=-14
b=-14/2
b=-7
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