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1.8=2.1h+-5.7+-4.6h
We move all terms to the left:
1.8-(2.1h+-5.7+-4.6h)=0
We add all the numbers together, and all the variables
-(-2.5h)+1.8=0
We get rid of parentheses
2.5h+1.8=0
We move all terms containing h to the left, all other terms to the right
2.5h=-1.8
h=-1.8/2.5
h=-1/1.3888888888889
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