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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 240 // - 240
5/x-240 = 0
5*x^-1 = 240 // : 5
x^-1 = 48
-1 < 0
1/(x^1) = 48 // * x^1
1 = 48*x^1 // : 48
1/48 = x^1
x = 1/48
x = 1/48
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