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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
104/h = 13/10 // - 13/10
104/h-(13/10) = 0
104/h-13/10 = 0
104*h^-1 = 13/10 // : 104
h^-1 = 1/80
-1 < 0
1/(h^1) = 1/80 // * h^1
1 = 1/80*h^1 // : 1/80
80 = h^1
h = 80
h = 80
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