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x in (-oo:+oo)
(((1/3)*x^1)/4)*x = 12 // - 12
(((1/3)*x^1)/4)*x-12 = 0
(((1/3)*x)/4)*x-12 = 0
1/12*x^2 = 12 // : 1/12
x^2 = 144
x^2 = 144 // ^ 1/2
abs(x) = 12
x = 12 or x = -12
x in { 12, -12 }
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