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