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x^2*((28*x^3-(24*x))/4) = 0
x^2*((28*x^3-24*x)/4) = 0
(x^2*(28*x^3-24*x))/4 = 0
28*x^3-24*x = 0
4*x*(7*x^2-6) = 0
7*x^2 = 6 // : 7
x^2 = 6/7
x^2 = 6/7 // ^ 1/2
abs(x) = (6/7)^(1/2)
x = (6/7)^(1/2) or x = -(6/7)^(1/2)
4*x*(x-(6/7)^(1/2))*(x+(6/7)^(1/2)) = 0
(4*x*x^2*(x-(6/7)^(1/2))*(x+(6/7)^(1/2)))/4 = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x+(6/7)^(1/2) )
x+(6/7)^(1/2) = 0 // - (6/7)^(1/2)
x = -(6/7)^(1/2)
( x-(6/7)^(1/2) )
x-(6/7)^(1/2) = 0 // + (6/7)^(1/2)
x = (6/7)^(1/2)
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0, -(6/7)^(1/2), (6/7)^(1/2), 0 }
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