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h in (-oo:+oo)
-1/2 = (5/18)*h // - (5/18)*h
-((5/18)*h)-1/2 = 0
(-5/18)*h-1/2 = 0
-5/18*h-1/2 = 0 // + 1/2
-5/18*h = 1/2 // : -5/18
h = 1/2/(-5/18)
h = -9/5
h = -9/5
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