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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
24 = 18-(16/h)-14 // - 18-(16/h)-14
16/h-18+14+24 = 0
16*h^-1 = -20 // : 16
h^-1 = -5/4
-1 < 0
1/(h^1) = -5/4 // * h^1
1 = -5/4*h^1 // : -5/4
-4/5 = h^1
h = -4/5
h = -4/5
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