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12=9h+84
We move all terms to the left:
12-(9h+84)=0
We get rid of parentheses
-9h-84+12=0
We add all the numbers together, and all the variables
-9h-72=0
We move all terms containing h to the left, all other terms to the right
-9h=72
h=72/-9
h=-8
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