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h in (-oo:+oo)
21/2 = (3/4)*h // - (3/4)*h
21/2-((3/4)*h) = 0
(-3/4)*h+21/2 = 0
21/2-3/4*h = 0 // - 21/2
-3/4*h = -21/2 // : -3/4
h = -21/2/(-3/4)
h = 14
h = 14
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