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-4(7b-7)=112
We move all terms to the left:
-4(7b-7)-(112)=0
We multiply parentheses
-28b+28-112=0
We add all the numbers together, and all the variables
-28b-84=0
We move all terms containing b to the left, all other terms to the right
-28b=84
b=84/-28
b=-3
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