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2.1h-5.7-4.6h=1.8
We move all terms to the left:
2.1h-5.7-4.6h-(1.8)=0
We add all the numbers together, and all the variables
-2.5h-7.5=0
We move all terms containing h to the left, all other terms to the right
-2.5h=7.5
h=7.5/-2.5
h=-3
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