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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
120/h = 10 // - 10
120/h-10 = 0
120*h^-1 = 10 // : 120
h^-1 = 1/12
-1 < 0
1/(h^1) = 1/12 // * h^1
1 = 1/12*h^1 // : 1/12
12 = h^1
h = 12
h = 12
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