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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2400/x = 3/100 // - 3/100
2400/x-(3/100) = 0
2400/x-3/100 = 0
2400*x^-1 = 3/100 // : 2400
x^-1 = 1/80000
-1 < 0
1/(x^1) = 1/80000 // * x^1
1 = 1/80000*x^1 // : 1/80000
80000 = x^1
x = 80000
x = 80000
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