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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
65 = 120/x // - 120/x
65-(120/x) = 0
65-120*x^-1 = 0
-120*x^-1 = -65 // : -120
x^-1 = 13/24
-1 < 0
1/(x^1) = 13/24 // * x^1
1 = 13/24*x^1 // : 13/24
24/13 = x^1
x = 24/13
x = 24/13
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