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10+b/20=9
We move all terms to the left:
10+b/20-(9)=0
We add all the numbers together, and all the variables
b/20+1=0
We multiply all the terms by the denominator
b+1*20=0
We add all the numbers together, and all the variables
b+20=0
We move all terms containing b to the left, all other terms to the right
b=-20
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