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+4=3H-6
We move all terms to the left:
+4-(3H-6)=0
We get rid of parentheses
-3H+6+4=0
We add all the numbers together, and all the variables
-3H+10=0
We move all terms containing H to the left, all other terms to the right
-3H=-10
H=-10/-3
H=3+1/3