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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(11/9)*x+7/9 = 2/(x^2) // - 2/(x^2)
(11/9)*x-(2/(x^2))+7/9 = 0
(11/9)*x-2*x^-2+7/9 = 0
11/9*x^1-2*x^-2+7/9*x^0 = 0
(11/9*x^3+7/9*x^2-2*x^0)/(x^2) = 0 // * x^4
x^2*(11/9*x^3+7/9*x^2-2*x^0) = 0
x^2
(11/9)*x^3+(7/9)*x^2-2 = 0
(11/9)*x^3+(7/9)*x^2-2 = 0 // * 0
{ 1, -1, 2, -2, 3, -3, 6, -6, 9, -9, 18, -18 }
1
x = 1
11*x^3+7*x^2-18 = 0
1
x-1
11*x^2+18*x+18
11*x^3+7*x^2-18
x-1
11*x^2-11*x^3
18*x^2-18
18*x-18*x^2
18*x-18
18-18*x
0
11*x^2+18*x+18 = 0
DELTA = 18^2-(4*11*18)
DELTA = -468
DELTA < 0
x in { 1}
x = 1
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