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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 234 // - 234
3/x-234 = 0
3*x^-1 = 234 // : 3
x^-1 = 78
-1 < 0
1/(x^1) = 78 // * x^1
1 = 78*x^1 // : 78
1/78 = x^1
x = 1/78
x = 1/78
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