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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
-14b+84=0
We move all terms containing b to the left, all other terms to the right
-14b=-84
b=-84/-14
b=+6
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