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=-2H^+7H+4
We move all terms to the left:
-(-2H^+7H+4)=0
We get rid of parentheses
2H^-7H-4=0
We add all the numbers together, and all the variables
-5H-4=0
We move all terms containing H to the left, all other terms to the right
-5H=4
H=4/-5
H=-4/5
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