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H in (-oo:+oo)
(2/3)*(2*H-12)-6*H-5 = 0
2/3*(2*H-12)-6*H-5 = 0
2/3*(2*H-12)-6*H-5 = 0
-14/3*H-8-5 = 0
-14/3*H-13 = 0
-14/3*H-13 = 0
-14/3*H-13 = 0 // + 13
-14/3*H = 13 // : -14/3
H = 13/(-14/3)
H = -39/14
H = -39/14
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