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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-7 = 2/11 // - 2/11
6/x-(2/11)-7 = 0
6/x-2/11-7 = 0
6*x^-1 = 79/11 // : 6
x^-1 = 79/66
-1 < 0
1/(x^1) = 79/66 // * x^1
1 = 79/66*x^1 // : 79/66
66/79 = x^1
x = 66/79
x = 66/79
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