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h in (-oo:+oo)
(4/3)*(21/2) = (4/3)*(3/4)*h // - (4/3)*(3/4)*h
(4/3)*(21/2)-((4/3)*(3/4)*h) = 0
(4/3)*(21/2)-h = 0
14-h = 0 // - 14
-h = -14 // * -1
h = 14
h = 14
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