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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)
9/(x^2)-(8/x) = 9/x-2 // - 9/x-2
9/(x^2)-(8/x)-(9/x)+2 = 0
9/(x^2)-8*x^-1-9*x^-1+2 = 0
9*x^-2-17*x^-1+2 = 0
t_1 = x^-1
9*t_1^2-17*t_1^1+2 = 0
9*t_1^2-17*t_1+2 = 0
DELTA = (-17)^2-(2*4*9)
DELTA = 217
DELTA > 0
t_1 = (217^(1/2)+17)/(2*9) or t_1 = (17-217^(1/2))/(2*9)
t_1 = (217^(1/2)+17)/18 or t_1 = (17-217^(1/2))/18
t_1 = (17-217^(1/2))/18
x^-1-((17-217^(1/2))/18) = 0
1*x^-1 = (17-217^(1/2))/18 // : 1
x^-1 = (17-217^(1/2))/18
-1 < 0
1/(x^1) = (17-217^(1/2))/18 // * x^1
1 = ((17-217^(1/2))/18)*x^1 // : (17-217^(1/2))/18
18*(17-217^(1/2))^-1 = x^1
x = 18*(17-217^(1/2))^-1
t_1 = (217^(1/2)+17)/18
x^-1-((217^(1/2)+17)/18) = 0
1*x^-1 = (217^(1/2)+17)/18 // : 1
x^-1 = (217^(1/2)+17)/18
-1 < 0
1/(x^1) = (217^(1/2)+17)/18 // * x^1
1 = ((217^(1/2)+17)/18)*x^1 // : (217^(1/2)+17)/18
18*(217^(1/2)+17)^-1 = x^1
x = 18*(217^(1/2)+17)^-1
x in { 18*(17-217^(1/2))^-1, 18*(217^(1/2)+17)^-1 }
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