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-10(b-91)=80
We move all terms to the left:
-10(b-91)-(80)=0
We multiply parentheses
-10b+910-80=0
We add all the numbers together, and all the variables
-10b+830=0
We move all terms containing b to the left, all other terms to the right
-10b=-830
b=-830/-10
b=+83
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