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-9(h-80)=-81
We move all terms to the left:
-9(h-80)-(-81)=0
We add all the numbers together, and all the variables
-9(h-80)+81=0
We multiply parentheses
-9h+720+81=0
We add all the numbers together, and all the variables
-9h+801=0
We move all terms containing h to the left, all other terms to the right
-9h=-801
h=-801/-9
h=+89
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