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12.20h-7.15=90.45
We move all terms to the left:
12.20h-7.15-(90.45)=0
We add all the numbers together, and all the variables
12.20h-97.6=0
We move all terms containing h to the left, all other terms to the right
12.20h=97.6
h=97.6/12.20
h=8
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