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2b+20=8b-10
We move all terms to the left:
2b+20-(8b-10)=0
We get rid of parentheses
2b-8b+10+20=0
We add all the numbers together, and all the variables
-6b+30=0
We move all terms containing b to the left, all other terms to the right
-6b=-30
b=-30/-6
b=+5
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