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h in (-oo:+oo)
(15/(-2))*h = 5/12 // - 5/12
(15/(-2))*h-(5/12) = 0
(15/(-2))*h-5/12 = 0
-15/2*h-5/12 = 0 // + 5/12
-15/2*h = 5/12 // : -15/2
h = 5/12/(-15/2)
h = -1/18
h = -1/18
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