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27=-b-30
We move all terms to the left:
27-(-b-30)=0
We add all the numbers together, and all the variables
-(-1b-30)+27=0
We get rid of parentheses
1b+30+27=0
We add all the numbers together, and all the variables
b+57=0
We move all terms containing b to the left, all other terms to the right
b=-57
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