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=-0.2^2+2H
We move all terms to the left:
-(-0.2^2+2H)=0
We get rid of parentheses
-2H+0.2^2=0
We add all the numbers together, and all the variables
-2H+0.04=0
We move all terms containing H to the left, all other terms to the right
-2H=-0.04
H=-0.04/-2
H=0.04/2
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