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h in (-oo:+oo)
117 = (13/2)*h // - (13/2)*h
117-((13/2)*h) = 0
(-13/2)*h+117 = 0
117-13/2*h = 0 // - 117
-13/2*h = -117 // : -13/2
h = -117/(-13/2)
h = 18
h = 18
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