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72=5b-3b
We move all terms to the left:
72-(5b-3b)=0
We add all the numbers together, and all the variables
-(+2b)+72=0
We get rid of parentheses
-2b+72=0
We move all terms containing b to the left, all other terms to the right
-2b=-72
b=-72/-2
b=+36
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