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b=5b-72
We move all terms to the left:
b-(5b-72)=0
We get rid of parentheses
b-5b+72=0
We add all the numbers together, and all the variables
-4b+72=0
We move all terms containing b to the left, all other terms to the right
-4b=-72
b=-72/-4
b=+18
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