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(4*x^6)/9-((5*x^3)/18) = 0
(4*x^6)/9+(-5/18)*x^3 = 0
4/9*x^6-5/18*x^3 = 0
t_1 = x^3
4/9*t_1^2-5/18*t_1^1 = 0
4/9*t_1^2-5/18*t_1 = 0
DELTA = (-5/18)^2-(0*4/9*4)
DELTA = 25/324
DELTA > 0
t_1 = ((25/324)^(1/2)+5/18)/(4/9*2) or t_1 = (5/18-(25/324)^(1/2))/(4/9*2)
t_1 = 5/8 or t_1 = 0
t_1 = 0
x^3+0 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
t_1 = 5/8
x^3-5/8 = 0
1*x^3 = 5/8 // : 1
x^3 = 5/8
x^3 = 5/8 // ^ 1/3
x = (5/8)^(1/3)
x in { 0, (5/8)^(1/3) }
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