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H in (-oo:+oo)
-9*(H/2) = 19 // - 19
-9*(H/2)-19 = 0
-9/2*H-19 = 0 // + 19
-9/2*H = 19 // : -9/2
H = 19/(-9/2)
H = -38/9
H = -38/9
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