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(12)=2H+6
We move all terms to the left:
(12)-(2H+6)=0
We get rid of parentheses
-2H-6+12=0
We add all the numbers together, and all the variables
-2H+6=0
We move all terms containing H to the left, all other terms to the right
-2H=-6
H=-6/-2
H=+3
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