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