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h in (-oo:+oo)
30 = (13/2)*h // - (13/2)*h
30-((13/2)*h) = 0
(-13/2)*h+30 = 0
30-13/2*h = 0 // - 30
-13/2*h = -30 // : -13/2
h = -30/(-13/2)
h = 60/13
h = 60/13
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