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x in (-oo:+oo)
((4*x)/12)*x = 1/3 // - 1/3
((4*x)/12)*x-(1/3) = 0
((4*x)/12)*x-1/3 = 0
1/3*x^2 = 1/3 // : 1/3
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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