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3b=5b-20
We move all terms to the left:
3b-(5b-20)=0
We get rid of parentheses
3b-5b+20=0
We add all the numbers together, and all the variables
-2b+20=0
We move all terms containing b to the left, all other terms to the right
-2b=-20
b=-20/-2
b=+10
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