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(0)=-2H+9
We move all terms to the left:
(0)-(-2H+9)=0
We add all the numbers together, and all the variables
-(-2H+9)=0
We get rid of parentheses
2H-9=0
We move all terms containing H to the left, all other terms to the right
2H=9
H=9/2
H=4+1/2
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