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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
16/7-(4.8/h) = 0
16/7-4.8*h^-1 = 0
-4.8*h^-1 = -16/7 // : -4.8
h^-1 = 0.47619048
-1 < 0
1/(h^1) = 0.47619048 // * h^1
1 = 0.47619048*h^1 // : 0.47619048
2.09999998 = h^1
h = 2.09999998
h = 2.09999998
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