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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)
(11/7)*x+3/7 = 2/(x^2) // - 2/(x^2)
(11/7)*x-(2/(x^2))+3/7 = 0
(11/7)*x-2*x^-2+3/7 = 0
11/7*x^1-2*x^-2+3/7*x^0 = 0
(11/7*x^3+3/7*x^2-2*x^0)/(x^2) = 0 // * x^4
x^2*(11/7*x^3+3/7*x^2-2*x^0) = 0
x^2
(11/7)*x^3+(3/7)*x^2-2 = 0
(11/7)*x^3+(3/7)*x^2-2 = 0 // * 0
{ 1, -1, 2, -2, 7, -7, 14, -14 }
1
x = 1
11*x^3+3*x^2-14 = 0
1
x-1
11*x^2+14*x+14
11*x^3+3*x^2-14
x-1
11*x^2-11*x^3
14*x^2-14
14*x-14*x^2
14*x-14
14-14*x
0
11*x^2+14*x+14 = 0
DELTA = 14^2-(4*11*14)
DELTA = -420
DELTA < 0
x in { 1}
x = 1
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