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-8(b+-2)=72
We move all terms to the left:
-8(b+-2)-(72)=0
We add all the numbers together, and all the variables
-8(b-2)-72=0
We multiply parentheses
-8b+16-72=0
We add all the numbers together, and all the variables
-8b-56=0
We move all terms containing b to the left, all other terms to the right
-8b=56
b=56/-8
b=-7
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