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2b-5=21-7b
We move all terms to the left:
2b-5-(21-7b)=0
We add all the numbers together, and all the variables
2b-(-7b+21)-5=0
We get rid of parentheses
2b+7b-21-5=0
We add all the numbers together, and all the variables
9b-26=0
We move all terms containing b to the left, all other terms to the right
9b=26
b=26/9
b=2+8/9
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