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71+5b=9b-13
We move all terms to the left:
71+5b-(9b-13)=0
We get rid of parentheses
5b-9b+13+71=0
We add all the numbers together, and all the variables
-4b+84=0
We move all terms containing b to the left, all other terms to the right
-4b=-84
b=-84/-4
b=+21
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