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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-3 = 6 // - 6
7/x-6-3 = 0
7*x^-1 = 9 // : 7
x^-1 = 9/7
-1 < 0
1/(x^1) = 9/7 // * x^1
1 = 9/7*x^1 // : 9/7
7/9 = x^1
x = 7/9
x = 7/9
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