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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)
2/(3*x) = 5 // - 5
2/(3*x)-5 = 0
2/3*x^-1 = 5 // : 2/3
x^-1 = 15/2
-1 < 0
1/(x^1) = 15/2 // * x^1
1 = 15/2*x^1 // : 15/2
2/15 = x^1
x = 2/15
x = 2/15
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