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h/4-9=12
We move all terms to the left:
h/4-9-(12)=0
We add all the numbers together, and all the variables
h/4-21=0
We multiply all the terms by the denominator
h-21*4=0
We add all the numbers together, and all the variables
h-84=0
We move all terms containing h to the left, all other terms to the right
h=84
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