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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)
2-(5/x) = 3/(x^2) // - 3/(x^2)
2-(5/x)-(3/(x^2)) = 0
2-5*x^-1-3*x^-2 = 0
t_1 = x^-1
2-3*t_1^2-5*t_1^1 = 0
2-3*t_1^2-5*t_1 = 0
DELTA = (-5)^2-(-3*2*4)
DELTA = 49
DELTA > 0
t_1 = (49^(1/2)+5)/(-3*2) or t_1 = (5-49^(1/2))/(-3*2)
t_1 = -2 or t_1 = 1/3
t_1 = -2
x^-1+2 = 0
1*x^-1 = -2 // : 1
x^-1 = -2
-1 < 0
1/(x^1) = -2 // * x^1
1 = -2*x^1 // : -2
-1/2 = x^1
x = -1/2
t_1 = 1/3
x^-1-1/3 = 0
1*x^-1 = 1/3 // : 1
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x in { -1/2, 3 }
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