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-4-2b=-b
We move all terms to the left:
-4-2b-(-b)=0
We add all the numbers together, and all the variables
-2b-(-1b)-4=0
We get rid of parentheses
-2b+1b-4=0
We add all the numbers together, and all the variables
-1b-4=0
We move all terms containing b to the left, all other terms to the right
-b=4
b=4/-1
b=-4
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