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h in (-oo:+oo)
(1*h)/2 = 15 // - 15
(1*h)/2-15 = 0
h/2-15 = 0
1/2*h-15 = 0 // + 15
1/2*h = 15 // : 1/2
h = 15/1/2
h = 30
h = 30
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