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=-5^2+30H+10
We move all terms to the left:
-(-5^2+30H+10)=0
We get rid of parentheses
-30H-10+5^2=0
We add all the numbers together, and all the variables
-30H+15=0
We move all terms containing H to the left, all other terms to the right
-30H=-15
H=-15/-30
H=1/2
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