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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
24 = 18-(14/h)-16 // - 18-(14/h)-16
14/h-18+16+24 = 0
14*h^-1 = -22 // : 14
h^-1 = -11/7
-1 < 0
1/(h^1) = -11/7 // * h^1
1 = -11/7*h^1 // : -11/7
-7/11 = h^1
h = -7/11
h = -7/11
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