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x in (-oo:+oo)
x = ((2*y)/3)*y-l // - ((2*y)/3)*y-l
l+x-(((2*y)/3)*y) = 0
l+x+(-2/3)*y^2 = 0
l+x-2/3*y^2 = 0 // - l-2/3*y^2
x = -(l-2/3*y^2)
x = -(l-2/3*y^2)
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