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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 0.6 // - 0.6
5/x-0.6 = 0
5*x^-1 = 0.6 // : 5
x^-1 = 0.12
-1 < 0
1/(x^1) = 0.12 // * x^1
1 = 0.12*x^1 // : 0.12
8.33333333 = x^1
x = 8.33333333
x = 8.33333333
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