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h in (-oo:+oo)
(3/(-4))*h = 18 // - 18
(3/(-4))*h-18 = 0
-3/4*h-18 = 0 // + 18
-3/4*h = 18 // : -3/4
h = 18/(-3/4)
h = -24
h = -24
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