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h in (-oo:+oo)
(7/4)*h = (1/4)*h-12 // - (1/4)*h-12
(7/4)*h-((1/4)*h)+12 = 0
(7/4)*h+(-1/4)*h+12 = 0
3/2*h+12 = 0 // - 12
3/2*h = -12 // : 3/2
h = -12/3/2
h = -8
h = -8
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