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=-4.9^2+20H+10
We move all terms to the left:
-(-4.9^2+20H+10)=0
We get rid of parentheses
-20H-10+4.9^2=0
We add all the numbers together, and all the variables
-20H+14.01=0
We move all terms containing H to the left, all other terms to the right
-20H=-14.01
H=-14.01/-20
H=6.97014925373/9.95024875622
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