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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = 1.54 // - 1.54
14/x-1.54 = 0
14*x^-1 = 1.54 // : 14
x^-1 = 0.11
-1 < 0
1/(x^1) = 0.11 // * x^1
1 = 0.11*x^1 // : 0.11
9.09090909 = x^1
x = 9.09090909
x = 9.09090909
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