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h in (-oo:+oo)
-9 = -h/2-1 // + -h/2-1
1-(-h/2)-9 = 0
(1/2)*h-9+1 = 0
1/2*h-8 = 0 // + 8
1/2*h = 8 // : 1/2
h = 8/1/2
h = 16
h = 16
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