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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/5 = 15/x // - 15/x
18/5-(15/x) = 0
18/5-15*x^-1 = 0
-15*x^-1 = -18/5 // : -15
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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