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b+7=-7b-9
We move all terms to the left:
b+7-(-7b-9)=0
We get rid of parentheses
b+7b+9+7=0
We add all the numbers together, and all the variables
8b+16=0
We move all terms containing b to the left, all other terms to the right
8b=-16
b=-16/8
b=-2
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