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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-3 = 4/x-((6*x)/(x^2))-3+9 // - 4/x-((6*x)/(x^2))-3+9
2/x-(4/x)+(6*x)/(x^2)-9-3+3 = 0
2/x-4*x^-1+(6*x)/(x^2)-9-3+3 = 0
4*x^-1 = 9 // : 4
x^-1 = 9/4
-1 < 0
1/(x^1) = 9/4 // * x^1
1 = 9/4*x^1 // : 9/4
4/9 = x^1
x = 4/9
x = 4/9
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