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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x-3+3 = 10/(x^2)-9 // - 10/(x^2)-9
1/x+1/x-(10/(x^2))-3+3+9 = 0
1/x+1/x-10*x^-2-3+3+9 = 0
2*x^-1-10*x^-2+9 = 0
t_1 = x^-1
2*t_1^1-10*t_1^2+9 = 0
2*t_1-10*t_1^2+9 = 0
DELTA = 2^2-(-10*4*9)
DELTA = 364
DELTA > 0
t_1 = (364^(1/2)-2)/(-10*2) or t_1 = (-364^(1/2)-2)/(-10*2)
t_1 = (2*91^(1/2)-2)/(-20) or t_1 = (-2*91^(1/2)-2)/(-20)
t_1 = (2*91^(1/2)-2)/(-20)
x^-1-((2*91^(1/2)-2)/(-20)) = 0
1*x^-1 = (2*91^(1/2)-2)/(-20) // : 1
x^-1 = (2*91^(1/2)-2)/(-20)
-1 < 0
1/(x^1) = (2*91^(1/2)-2)/(-20) // * x^1
1 = ((2*91^(1/2)-2)/(-20))*x^1 // : (2*91^(1/2)-2)/(-20)
-20*(2*91^(1/2)-2)^-1 = x^1
x = -20*(2*91^(1/2)-2)^-1
t_1 = (-2*91^(1/2)-2)/(-20)
x^-1-((-2*91^(1/2)-2)/(-20)) = 0
1*x^-1 = (-2*91^(1/2)-2)/(-20) // : 1
x^-1 = (-2*91^(1/2)-2)/(-20)
-1 < 0
1/(x^1) = (-2*91^(1/2)-2)/(-20) // * x^1
1 = ((-2*91^(1/2)-2)/(-20))*x^1 // : (-2*91^(1/2)-2)/(-20)
-20*(-2*91^(1/2)-2)^-1 = x^1
x = -20*(-2*91^(1/2)-2)^-1
x in { -20*(2*91^(1/2)-2)^-1, -20*(-2*91^(1/2)-2)^-1 }
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