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h in (-oo:+oo)
4 = (1/5)*h // - (1/5)*h
4-((1/5)*h) = 0
(-1/5)*h+4 = 0
4-1/5*h = 0 // - 4
-1/5*h = -4 // : -1/5
h = -4/(-1/5)
h = 20
h = 20
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