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h in (-oo:+oo)
(1.5*h)/2 = 10 // - 10
(1.5*h)/2-10 = 0
0.75*h-10 = 0 // + 10
0.75*h = 10 // : 0.75
h = 10/0.75
h = 13.33333333
h = 13.33333333
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