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5b=20+9b
We move all terms to the left:
5b-(20+9b)=0
We add all the numbers together, and all the variables
5b-(9b+20)=0
We get rid of parentheses
5b-9b-20=0
We add all the numbers together, and all the variables
-4b-20=0
We move all terms containing b to the left, all other terms to the right
-4b=20
b=20/-4
b=-5
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