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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/25 = 1/x // - 1/x
6/25-(1/x) = 0
6/25-x^-1 = 0
-1*x^-1 = -6/25 // : -1
x^-1 = 6/25
-1 < 0
1/(x^1) = 6/25 // * x^1
1 = 6/25*x^1 // : 6/25
25/6 = x^1
x = 25/6
x = 25/6
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