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-(1-b)+7b=-15+6b
We move all terms to the left:
-(1-b)+7b-(-15+6b)=0
We add all the numbers together, and all the variables
-(-1b+1)+7b-(6b-15)=0
We add all the numbers together, and all the variables
7b-(-1b+1)-(6b-15)=0
We get rid of parentheses
7b+1b-6b-1+15=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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