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b=78b-13
We move all terms to the left:
b-(78b-13)=0
We get rid of parentheses
b-78b+13=0
We add all the numbers together, and all the variables
-77b+13=0
We move all terms containing b to the left, all other terms to the right
-77b=-13
b=-13/-77
b=13/77
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