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