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=-16^2+84H+72
We move all terms to the left:
-(-16^2+84H+72)=0
We get rid of parentheses
-84H-72+16^2=0
We add all the numbers together, and all the variables
-84H+184=0
We move all terms containing H to the left, all other terms to the right
-84H=-184
H=-184/-84
H=2+4/21
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