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6-7(6b-1)=-239
We move all terms to the left:
6-7(6b-1)-(-239)=0
We add all the numbers together, and all the variables
-7(6b-1)+245=0
We multiply parentheses
-42b+7+245=0
We add all the numbers together, and all the variables
-42b+252=0
We move all terms containing b to the left, all other terms to the right
-42b=-252
b=-252/-42
b=+6
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