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b/4=-20
We move all terms to the left:
b/4-(-20)=0
We add all the numbers together, and all the variables
b/4+20=0
We multiply all the terms by the denominator
b+20*4=0
We add all the numbers together, and all the variables
b+80=0
We move all terms containing b to the left, all other terms to the right
b=-80
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