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-6b-2(1+3b)=-86
We move all terms to the left:
-6b-2(1+3b)-(-86)=0
We add all the numbers together, and all the variables
-6b-2(3b+1)-(-86)=0
We add all the numbers together, and all the variables
-6b-2(3b+1)+86=0
We multiply parentheses
-6b-6b-2+86=0
We add all the numbers together, and all the variables
-12b+84=0
We move all terms containing b to the left, all other terms to the right
-12b=-84
b=-84/-12
b=+7
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