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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x+6 = 7/3 // - 7/3
10/x-(7/3)+6 = 0
10/x-7/3+6 = 0
10*x^-1 = -11/3 // : 10
x^-1 = -11/30
-1 < 0
1/(x^1) = -11/30 // * x^1
1 = -11/30*x^1 // : -11/30
-30/11 = x^1
x = -30/11
x = -30/11
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