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-4(4b-8)+2(1+6b)=-8b-1+b-7
We move all terms to the left:
-4(4b-8)+2(1+6b)-(-8b-1+b-7)=0
We add all the numbers together, and all the variables
-4(4b-8)+2(6b+1)-(-7b-8)=0
We multiply parentheses
-16b+12b-(-7b-8)+32+2=0
We get rid of parentheses
-16b+12b+7b+8+32+2=0
We add all the numbers together, and all the variables
3b+42=0
We move all terms containing b to the left, all other terms to the right
3b=-42
b=-42/3
b=-14
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