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4+b=-b
We move all terms to the left:
4+b-(-b)=0
We add all the numbers together, and all the variables
b-(-1b)+4=0
We get rid of parentheses
b+1b+4=0
We add all the numbers together, and all the variables
2b+4=0
We move all terms containing b to the left, all other terms to the right
2b=-4
b=-4/2
b=-2
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