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h in (-oo:+oo)
(1/(-4))*h = -12 // + 12
(1/(-4))*h+12 = 0
12-1/4*h = 0 // - 12
-1/4*h = -12 // : -1/4
h = -12/(-1/4)
h = 48
h = 48
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