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(H)=2H-9
We move all terms to the left:
(H)-(2H-9)=0
We get rid of parentheses
H-2H+9=0
We add all the numbers together, and all the variables
-1H+9=0
We move all terms containing H to the left, all other terms to the right
-H=-9
H=-9/-1
H=+9
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