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