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x in (-oo:+oo)
x*((4*x^2-300)/6) = 0
(x*(4*x^2-300))/6 = 0
( 4*x^2-300 )
4*x^2 = 300 // : 4
x^2 = 75
x^2 = 75 // ^ 1/2
abs(x) = 5*3^(1/2)
x = 5*3^(1/2) or x = -(5*3^(1/2))
( x )
x = 0
x in { 5*3^(1/2), -(5*3^(1/2)), 0 }
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