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8.1+3.8h=7.2
We move all terms to the left:
8.1+3.8h-(7.2)=0
We add all the numbers together, and all the variables
3.8h+0.9=0
We move all terms containing h to the left, all other terms to the right
3.8h=-0.9
h=-0.9/3.8
h=-0.9/3.8
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