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-4(3b+1)=-100
We move all terms to the left:
-4(3b+1)-(-100)=0
We add all the numbers together, and all the variables
-4(3b+1)+100=0
We multiply parentheses
-12b-4+100=0
We add all the numbers together, and all the variables
-12b+96=0
We move all terms containing b to the left, all other terms to the right
-12b=-96
b=-96/-12
b=+8
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