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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6000/x = 1000 // - 1000
6000/x-1000 = 0
6000*x^-1 = 1000 // : 6000
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
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