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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-(9/x)+3 = -(54/(x^2)-9) // + 54/(x^2)-9
54/(x^2)-(9/x)-9+1+3 = 0
54/(x^2)-9*x^-1-9+1+3 = 0
54*x^-2-9*x^-1-5 = 0
t_1 = x^-1
54*t_1^2-9*t_1^1-5 = 0
54*t_1^2-9*t_1-5 = 0
DELTA = (-9)^2-(-5*4*54)
DELTA = 1161
DELTA > 0
t_1 = (1161^(1/2)+9)/(2*54) or t_1 = (9-1161^(1/2))/(2*54)
t_1 = (3*129^(1/2)+9)/108 or t_1 = (9-3*129^(1/2))/108
t_1 = (9-3*129^(1/2))/108
x^-1-((9-3*129^(1/2))/108) = 0
1*x^-1 = (9-3*129^(1/2))/108 // : 1
x^-1 = (9-3*129^(1/2))/108
-1 < 0
1/(x^1) = (9-3*129^(1/2))/108 // * x^1
1 = ((9-3*129^(1/2))/108)*x^1 // : (9-3*129^(1/2))/108
108*(9-3*129^(1/2))^-1 = x^1
x = 108*(9-3*129^(1/2))^-1
t_1 = (3*129^(1/2)+9)/108
x^-1-((3*129^(1/2)+9)/108) = 0
1*x^-1 = (3*129^(1/2)+9)/108 // : 1
x^-1 = (3*129^(1/2)+9)/108
-1 < 0
1/(x^1) = (3*129^(1/2)+9)/108 // * x^1
1 = ((3*129^(1/2)+9)/108)*x^1 // : (3*129^(1/2)+9)/108
108*(3*129^(1/2)+9)^-1 = x^1
x = 108*(3*129^(1/2)+9)^-1
x in { 108*(9-3*129^(1/2))^-1, 108*(3*129^(1/2)+9)^-1 }
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