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(x/6)*x^3+4*x^3-(4*x^2) = 0
(x/6)*x^3+4*x^3-4*x^2 = 0
1/6*x^4+4*x^3-4*x^2 = 0
x^2*(1/6*x^2+4*x-4) = 0
1/6*x^2+4*x-4 = 0
DELTA = 4^2-(-4*1/6*4)
DELTA = 56/3
DELTA > 0
x = ((56/3)^(1/2)-4)/(1/6*2) or x = (-(56/3)^(1/2)-4)/(1/6*2)
x = 3*((56/3)^(1/2)-4) or x = -3*((56/3)^(1/2)+4)
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { -3*((56/3)^(1/2)+4), 3*((56/3)^(1/2)-4), 0 }
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