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D( x )
x = 0
3/x-10 = 0
x = 0
x = 0
3/x-10 = 0
3/x-10 = 0
3*x^-1 = 10 // : 3
x^-1 = 10/3
-1 < 0
1/(x^1) = 10/3 // * x^1
1 = 10/3*x^1 // : 10/3
3/10 = x^1
x = 3/10
x in (-oo:0) U (0:3/10) U (3/10:+oo)
(3*x-8)/(3/x-10) = 0
(3*x-8)/(3*x^-1-10) = 0
3*x-8 = 0 // + 8
3*x = 8 // : 3
x = 8/3
x = 8/3
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