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x*((3*X^2-(12*x)+4)/(-3)) = 0
x*((3*X^2-12*x+4)/(-3)) = 0
(x*(3*X^2-12*x+4))/(-3) = 0
( 3*X^2-12*x+4 )
3*X^2-12*x+4 = 0 // - 3*X^2+4
-12*x = -(3*X^2+4) // : -12
x = (-(3*X^2+4))/(-12)
x = (3*X^2+4)/12
( x )
x = 0
x in { (3*X^2+4)/12, 0 }
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