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b-b=-8+2b
We move all terms to the left:
b-b-(-8+2b)=0
We add all the numbers together, and all the variables
b-b-(2b-8)=0
We add all the numbers together, and all the variables
-(2b-8)=0
We get rid of parentheses
-2b+8=0
We move all terms containing b to the left, all other terms to the right
-2b=-8
b=-8/-2
b=+4
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