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h in (-oo:+oo)
45 = (9/2)*h // - (9/2)*h
45-((9/2)*h) = 0
(-9/2)*h+45 = 0
45-9/2*h = 0 // - 45
-9/2*h = -45 // : -9/2
h = -45/(-9/2)
h = 10
h = 10
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