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h in (-oo:+oo)
5*(1/2)*h = 2.5 // - 2.5
5*(1/2)*h-2.5 = 0
5/2*h-2.5 = 0 // + 2.5
5/2*h = 2.5 // : 5/2
h = 2.5/5/2
h = 1
h = 1
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