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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)
(7/5)*x+3/5 = 2/(x^2) // - 2/(x^2)
(7/5)*x-(2/(x^2))+3/5 = 0
(7/5)*x-2*x^-2+3/5 = 0
7/5*x^1-2*x^-2+3/5*x^0 = 0
(7/5*x^3+3/5*x^2-2*x^0)/(x^2) = 0 // * x^4
x^2*(7/5*x^3+3/5*x^2-2*x^0) = 0
x^2
(7/5)*x^3+(3/5)*x^2-2 = 0
(7/5)*x^3+(3/5)*x^2-2 = 0 // * 0
{ 1, -1, 2, -2, 5, -5, 10, -10 }
1
x = 1
7*x^3+3*x^2-10 = 0
1
x-1
7*x^2+10*x+10
7*x^3+3*x^2-10
x-1
7*x^2-7*x^3
10*x^2-10
10*x-10*x^2
10*x-10
10-10*x
0
7*x^2+10*x+10 = 0
DELTA = 10^2-(4*7*10)
DELTA = -180
DELTA < 0
x in { 1}
x = 1
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