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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)
x/x-(10/x)-3+3 = 18/(x^2)-9 // - 18/(x^2)-9
x/x-(10/x)-(18/(x^2))-3+3+9 = 0
x/x-10*x^-1-18*x^-2-3+3+9 = 0
10-10*x^-1-18*x^-2 = 0
t_1 = x^-1
10-18*t_1^2-10*t_1^1 = 0
10-18*t_1^2-10*t_1 = 0
DELTA = (-10)^2-(-18*4*10)
DELTA = 820
DELTA > 0
t_1 = (820^(1/2)+10)/(-18*2) or t_1 = (10-820^(1/2))/(-18*2)
t_1 = (2*205^(1/2)+10)/(-36) or t_1 = (10-2*205^(1/2))/(-36)
t_1 = (2*205^(1/2)+10)/(-36)
x^-1-((2*205^(1/2)+10)/(-36)) = 0
1*x^-1 = (2*205^(1/2)+10)/(-36) // : 1
x^-1 = (2*205^(1/2)+10)/(-36)
-1 < 0
1/(x^1) = (2*205^(1/2)+10)/(-36) // * x^1
1 = ((2*205^(1/2)+10)/(-36))*x^1 // : (2*205^(1/2)+10)/(-36)
-36*(2*205^(1/2)+10)^-1 = x^1
x = -36*(2*205^(1/2)+10)^-1
t_1 = (10-2*205^(1/2))/(-36)
x^-1-((10-2*205^(1/2))/(-36)) = 0
1*x^-1 = (10-2*205^(1/2))/(-36) // : 1
x^-1 = (10-2*205^(1/2))/(-36)
-1 < 0
1/(x^1) = (10-2*205^(1/2))/(-36) // * x^1
1 = ((10-2*205^(1/2))/(-36))*x^1 // : (10-2*205^(1/2))/(-36)
-36*(10-2*205^(1/2))^-1 = x^1
x = -36*(10-2*205^(1/2))^-1
x in { -36*(2*205^(1/2)+10)^-1, -36*(10-2*205^(1/2))^-1 }
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