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