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b/2=-20
We move all terms to the left:
b/2-(-20)=0
We add all the numbers together, and all the variables
b/2+20=0
We multiply all the terms by the denominator
b+20*2=0
We add all the numbers together, and all the variables
b+40=0
We move all terms containing b to the left, all other terms to the right
b=-40
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