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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 2400/100 // - 2400/100
3/x-(2400/100) = 0
3/x-24 = 0
3*x^-1 = 24 // : 3
x^-1 = 8
-1 < 0
1/(x^1) = 8 // * x^1
1 = 8*x^1 // : 8
1/8 = x^1
x = 1/8
x = 1/8
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