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10b=b-20
We move all terms to the left:
10b-(b-20)=0
We get rid of parentheses
10b-b+20=0
We add all the numbers together, and all the variables
9b+20=0
We move all terms containing b to the left, all other terms to the right
9b=-20
b=-20/9
b=-2+2/9
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