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57=-7b+13
We move all terms to the left:
57-(-7b+13)=0
We get rid of parentheses
7b-13+57=0
We add all the numbers together, and all the variables
7b+44=0
We move all terms containing b to the left, all other terms to the right
7b=-44
b=-44/7
b=-6+2/7
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