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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-50/x = 24/x-3 // - 24/x-3
3-50/x-(24/x) = 0
3-50/x-24*x^-1 = 0
-74*x^-1 = -3 // : -74
x^-1 = 3/74
-1 < 0
1/(x^1) = 3/74 // * x^1
1 = 3/74*x^1 // : 3/74
74/3 = x^1
x = 74/3
x = 74/3
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