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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100*(24/x) = 7 // - 7
100*(24/x)-7 = 0
2400*x^-1 = 7 // : 2400
x^-1 = 7/2400
-1 < 0
1/(x^1) = 7/2400 // * x^1
1 = 7/2400*x^1 // : 7/2400
2400/7 = x^1
x = 2400/7
x = 2400/7
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