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