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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/25 = 25/x // - 25/x
30/25-(25/x) = 0
30/25-25*x^-1 = 0
-25*x^-1 = -6/5 // : -25
x^-1 = 6/125
-1 < 0
1/(x^1) = 6/125 // * x^1
1 = 6/125*x^1 // : 6/125
125/6 = x^1
x = 125/6
x = 125/6
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