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x in (-oo:+oo)
(x/4)*x-12 = 0
1/4*x^2 = 12 // : 1/4
x^2 = 48
x^2 = 48 // ^ 1/2
abs(x) = 4*3^(1/2)
x = 4*3^(1/2) or x = -(4*3^(1/2))
x in { 4*3^(1/2), -(4*3^(1/2)) }
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