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+4H=2H-15
We move all terms to the left:
+4H-(2H-15)=0
We get rid of parentheses
4H-2H+15=0
We add all the numbers together, and all the variables
2H+15=0
We move all terms containing H to the left, all other terms to the right
2H=-15
H=-15/2
H=-7+1/2
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