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8.1h+3.8h-5.6h=-7.2
We move all terms to the left:
8.1h+3.8h-5.6h-(-7.2)=0
We add all the numbers together, and all the variables
6.3h+7.2=0
We move all terms containing h to the left, all other terms to the right
6.3h=-7.2
h=-7.2/6.3
h=-1+0.9/6.3
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