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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
-20/h-7 = 33 // - 33
-20/h-33-7 = 0
-20*h^-1 = 40 // : -20
h^-1 = -2
-1 < 0
1/(h^1) = -2 // * h^1
1 = -2*h^1 // : -2
-1/2 = h^1
h = -1/2
h = -1/2
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