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h in (-oo:+oo)
7/20 = (7/10)*h // - (7/10)*h
7/20-((7/10)*h) = 0
(-7/10)*h+7/20 = 0
7/20-7/10*h = 0 // - 7/20
-7/10*h = -7/20 // : -7/10
h = -7/20/(-7/10)
h = 1/2
h = 1/2
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