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-11.9h+19.12=12h
We move all terms to the left:
-11.9h+19.12-(12h)=0
We add all the numbers together, and all the variables
-23.9h+19.12=0
We move all terms containing h to the left, all other terms to the right
-23.9h=-19.12
h=-19.12/-23.9
h=17.071428571429/21.339285714286
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