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h in (-oo:+oo)
1-(1000*((2*h)/6400)) = 0
(-5/16)*h+1 = 0
1-5/16*h = 0 // - 1
-5/16*h = -1 // : -5/16
h = -1/(-5/16)
h = 16/5
h = 16/5
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