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h in (-oo:+oo)
-6 = (1/20)*h // - (1/20)*h
-((1/20)*h)-6 = 0
(-1/20)*h-6 = 0
-1/20*h-6 = 0 // + 6
-1/20*h = 6 // : -1/20
h = 6/(-1/20)
h = -120
h = -120
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