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(H)=-16^2+28H+17
We move all terms to the left:
(H)-(-16^2+28H+17)=0
We get rid of parentheses
H-28H-17+16^2=0
We add all the numbers together, and all the variables
-27H+239=0
We move all terms containing H to the left, all other terms to the right
-27H=-239
H=-239/-27
H=8+23/27
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