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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3-10/x-((3*x)/x)-2 = 0
3-10/x-3-2 = 0
-10*x^-1 = 2 // : -10
x^-1 = -1/5
-1 < 0
1/(x^1) = -1/5 // * x^1
1 = -1/5*x^1 // : -1/5
-5 = x^1
x = -5
x = -5
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