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h in (-oo:+oo)
21/2-(1*h) = h/2 // - h/2
21/2-(1*h)-(h/2) = 0
21/2-h-(h/2) = 0
21/2-3/2*h = 0 // - 21/2
-3/2*h = -21/2 // : -3/2
h = -21/2/(-3/2)
h = 7
h = 7
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