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4b-20=2b+10
We move all terms to the left:
4b-20-(2b+10)=0
We get rid of parentheses
4b-2b-10-20=0
We add all the numbers together, and all the variables
2b-30=0
We move all terms containing b to the left, all other terms to the right
2b=30
b=30/2
b=15
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