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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/11 = 10/x // - 10/x
7/11-(10/x) = 0
7/11-10*x^-1 = 0
-10*x^-1 = -7/11 // : -10
x^-1 = 7/110
-1 < 0
1/(x^1) = 7/110 // * x^1
1 = 7/110*x^1 // : 7/110
110/7 = x^1
x = 110/7
x = 110/7
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