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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 18/7 // - 18/7
6/x-(18/7) = 0
6/x-18/7 = 0
6*x^-1 = 18/7 // : 6
x^-1 = 3/7
-1 < 0
1/(x^1) = 3/7 // * x^1
1 = 3/7*x^1 // : 3/7
7/3 = x^1
x = 7/3
x = 7/3
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