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20+3b=13-17b
We move all terms to the left:
20+3b-(13-17b)=0
We add all the numbers together, and all the variables
3b-(-17b+13)+20=0
We get rid of parentheses
3b+17b-13+20=0
We add all the numbers together, and all the variables
20b+7=0
We move all terms containing b to the left, all other terms to the right
20b=-7
b=-7/20
b=-7/20
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