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x in (-oo:+oo)
x = ((4*y)/3)*y-1 // - ((4*y)/3)*y-1
x-(((4*y)/3)*y)+1 = 0
x+(-4/3)*y^2+1 = 0
x-4/3*y^2+1 = 0 // - 1-4/3*y^2
x = -(1-4/3*y^2)
x = -(1-4/3*y^2)
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