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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 2.4 // - 2.4
5/x-2.4 = 0
5*x^-1 = 2.4 // : 5
x^-1 = 0.48
-1 < 0
1/(x^1) = 0.48 // * x^1
1 = 0.48*x^1 // : 0.48
2.08333333 = x^1
x = 2.08333333
x = 2.08333333
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