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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-7 = 6 // - 6
2/x-7-6 = 0
2*x^-1 = 13 // : 2
x^-1 = 13/2
-1 < 0
1/(x^1) = 13/2 // * x^1
1 = 13/2*x^1 // : 13/2
2/13 = x^1
x = 2/13
x = 2/13
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