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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
2/7 = 35/h // - 35/h
2/7-(35/h) = 0
2/7-35*h^-1 = 0
-35*h^-1 = -2/7 // : -35
h^-1 = 2/245
-1 < 0
1/(h^1) = 2/245 // * h^1
1 = 2/245*h^1 // : 2/245
245/2 = h^1
h = 245/2
h = 245/2
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