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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5000/x = 1.5 // - 1.5
5000/x-1.5 = 0
5000*x^-1 = 1.5 // : 5000
x^-1 = 0.0003
-1 < 0
1/(x^1) = 0.0003 // * x^1
1 = 0.0003*x^1 // : 0.0003
3333.33333333 = x^1
x = 3333.33333333
x = 3333.33333333
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