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81=4h+1
We move all terms to the left:
81-(4h+1)=0
We get rid of parentheses
-4h-1+81=0
We add all the numbers together, and all the variables
-4h+80=0
We move all terms containing h to the left, all other terms to the right
-4h=-80
h=-80/-4
h=+20
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