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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
15/h+35 = 95 // - 95
15/h-95+35 = 0
15*h^-1 = 60 // : 15
h^-1 = 4
-1 < 0
1/(h^1) = 4 // * h^1
1 = 4*h^1 // : 4
1/4 = h^1
h = 1/4
h = 1/4
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