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(H)=2H+4=18
We move all terms to the left:
(H)-(2H+4)=0
We get rid of parentheses
H-2H-4=0
We add all the numbers together, and all the variables
-1H-4=0
We move all terms containing H to the left, all other terms to the right
-H=4
H=4/-1
H=-4
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