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h in (-oo:+oo)
26 = (13/2)*h // - (13/2)*h
26-((13/2)*h) = 0
(-13/2)*h+26 = 0
26-13/2*h = 0 // - 26
-13/2*h = -26 // : -13/2
h = -26/(-13/2)
h = 4
h = 4
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