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