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4(b+91)=-28
We move all terms to the left:
4(b+91)-(-28)=0
We add all the numbers together, and all the variables
4(b+91)+28=0
We multiply parentheses
4b+364+28=0
We add all the numbers together, and all the variables
4b+392=0
We move all terms containing b to the left, all other terms to the right
4b=-392
b=-392/4
b=-98
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