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b/9+12=20
We move all terms to the left:
b/9+12-(20)=0
We add all the numbers together, and all the variables
b/9-8=0
We multiply all the terms by the denominator
b-8*9=0
We add all the numbers together, and all the variables
b-72=0
We move all terms containing b to the left, all other terms to the right
b=72
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