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b(-2)=-0.5(-2)
We move all terms to the left:
b(-2)-(-0.5(-2))=0
We add all the numbers together, and all the variables
b(-2)-1=0
We multiply parentheses
-2b-1=0
We move all terms containing b to the left, all other terms to the right
-2b=1
b=1/-2
b=-1/2
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