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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
269.5/x = 14 // - 14
269.5/x-14 = 0
269.5*x^-1 = 14 // : 269.5
x^-1 = 0.05194805
-1 < 0
1/(x^1) = 0.05194805 // * x^1
1 = 0.05194805*x^1 // : 0.05194805
19.25000072 = x^1
x = 19.25000072
x = 19.25000072
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