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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x+2 = 2-(4/x)+6 // - 2-(4/x)+6
4/x+(2*x)/x-6-2+2 = 0
4*x^-1 = 4 // : 4
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x = 1
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