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h in (-oo:+oo)
h/5 = 0.3 // - 0.3
h/5-0.3 = 0
1/5*h-0.3 = 0 // + 0.3
1/5*h = 0.3 // : 1/5
h = 0.3/1/5
h = 1.5
h = 1.5
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