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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.84/x = 24000 // - 24000
0.84/x-24000 = 0
0.84*x^-1 = 24000 // : 0.84
x^-1 = 28571.42857143
-1 < 0
1/(x^1) = 28571.42857143 // * x^1
1 = 28571.42857143*x^1 // : 28571.42857143
0.000035 = x^1
x = 0.000035
x = 0.000035
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