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7(-4b+8)=-168
We move all terms to the left:
7(-4b+8)-(-168)=0
We add all the numbers together, and all the variables
7(-4b+8)+168=0
We multiply parentheses
-28b+56+168=0
We add all the numbers together, and all the variables
-28b+224=0
We move all terms containing b to the left, all other terms to the right
-28b=-224
b=-224/-28
b=+8
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