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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/18 = 5/x // - 5/x
25/18-(5/x) = 0
25/18-5*x^-1 = 0
-5*x^-1 = -25/18 // : -5
x^-1 = 5/18
-1 < 0
1/(x^1) = 5/18 // * x^1
1 = 5/18*x^1 // : 5/18
18/5 = x^1
x = 18/5
x = 18/5
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