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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
20/4 = 3/h // - 3/h
20/4-(3/h) = 0
20/4-3*h^-1 = 0
-3*h^-1 = -5 // : -3
h^-1 = 5/3
-1 < 0
1/(h^1) = 5/3 // * h^1
1 = 5/3*h^1 // : 5/3
3/5 = h^1
h = 3/5
h = 3/5
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