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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
600/x = 10000 // - 10000
600/x-10000 = 0
600*x^-1 = 10000 // : 600
x^-1 = 50/3
-1 < 0
1/(x^1) = 50/3 // * x^1
1 = 50/3*x^1 // : 50/3
3/50 = x^1
x = 3/50
x = 3/50
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