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h in (-oo:+oo)
-0.25 = h/(-5) // - h/(-5)
-(h/(-5))-0.25 = 0
1/5*h-0.25 = 0 // + 0.25
1/5*h = 0.25 // : 1/5
h = 0.25/1/5
h = 1.25
h = 1.25
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