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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
6/7 = 42/h // - 42/h
6/7-(42/h) = 0
6/7-42*h^-1 = 0
-42*h^-1 = -6/7 // : -42
h^-1 = 1/49
-1 < 0
1/(h^1) = 1/49 // * h^1
1 = 1/49*h^1 // : 1/49
49 = h^1
h = 49
h = 49
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