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x in (-oo:+oo)
x*((-12*x^3-(48*x^2))/(-4)) = 0
x*((-12*x^3-48*x^2)/(-4)) = 0
(x*(-12*x^3-48*x^2))/(-4) = 0
-12*x^3-48*x^2 = 0
-12*x^2*(x+4) = 0
x+4 = 0 // - 4
x = -4
-12*x^2*(x+4) = 0
(-12*x*x^2*(x+4))/(-4) = 0
( -12*x^2 )
-12*x^2 = 0 // : -12
x^2 = 0
x = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x )
x = 0
x in { 0, -4, 0 }
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