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