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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x-3 = 10/x // - 10/x
15/x-(10/x)-3 = 0
15/x-10*x^-1-3 = 0
5*x^-1 = 3 // : 5
x^-1 = 3/5
-1 < 0
1/(x^1) = 3/5 // * x^1
1 = 3/5*x^1 // : 3/5
5/3 = x^1
x = 5/3
x = 5/3
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