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3*x-(x^2*y^-6*((4*y^4)/12)) = 0
3*x+(-1/3)*x^2*y^-2 = 0
3*x-1/3*x^2*y^-2 = 0
DELTA = 3^2-(-1/3*0*4*y^-2)
DELTA = 9
DELTA > 0
x = (9^(1/2)-3)/(-1/3*2*y^-2) or x = (-9^(1/2)-3)/(-1/3*2*y^-2)
x = 0 or x = 9*y^2
x in { 0, 9*y^2 }
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