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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
0 = (3*(4-h))/h // - (3*(4-h))/h
0-((3*(4-h))/h) = 0
-3*h^-1*(4-h) = 0
( -3*h^-1 )
-3*h^-1 = 0 // : -3
h^-1 = 0
h należy do O
( 4-h )
4-h = 0 // - 4
-h = -4 // * -1
h = 4
h = 4
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