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13=-b-1
We move all terms to the left:
13-(-b-1)=0
We add all the numbers together, and all the variables
-(-1b-1)+13=0
We get rid of parentheses
1b+1+13=0
We add all the numbers together, and all the variables
b+14=0
We move all terms containing b to the left, all other terms to the right
b=-14
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