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h in (-oo:+oo)
(3/4)*h = 10.5 // - 10.5
(3/4)*h-10.5 = 0
3/4*h-10.5 = 0 // + 10.5
3/4*h = 10.5 // : 3/4
h = 10.5/3/4
h = 14
h = 14
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