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h in (-oo:+oo)
(5*h)/9-4 = h // - h
(5*h)/9-h-4 = 0
-4/9*h-4 = 0 // + 4
-4/9*h = 4 // : -4/9
h = 4/(-4/9)
h = -9
h = -9
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