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H in (-oo:+oo)
H^2 = 36/49 // - 36/49
H^2-(36/49) = 0
H^2-36/49 = 0
1*H^2 = 36/49 // : 1
H^2 = 36/49
H^2 = 36/49 // ^ 1/2
abs(H) = 6/7
H = 6/7 or H = -6/7
H in { 6/7, -6/7 }
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