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h in (-oo:+oo)
5/9 = h/30 // - h/30
5/9-(h/30) = 0
5/9-1/30*h = 0 // - 5/9
-1/30*h = -5/9 // : -1/30
h = -5/9/(-1/30)
h = 50/3
h = 50/3
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