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x in (-oo:+oo)
-2*2*3*x*x*y = (-12/2)*y // - (-12/2)*y
-2*2*3*x*x*y-((-12/2)*y) = 0
6*y-2*2*3*x*x*y = 0
-12*x^2*y = -(6*y) // : -12*y
x^2 = 1/2
x^2 = 1/2 // ^ 1/2
abs(x) = (1/2)^(1/2)
x = (1/2)^(1/2) or x = -(1/2)^(1/2)
x in { (1/2)^(1/2), -(1/2)^(1/2) }
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