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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/15 = 25/x // - 25/x
5/15-(25/x) = 0
5/15-25*x^-1 = 0
-25*x^-1 = -1/3 // : -25
x^-1 = 1/75
-1 < 0
1/(x^1) = 1/75 // * x^1
1 = 1/75*x^1 // : 1/75
75 = x^1
x = 75
x = 75
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