for x = t-3 and for x = 3-t but t = y-3 t^2 = y^2-6y+9 so x^2 = y^2-6y+9 -6(y-3) + 9 x^2 = y^2 + 36 y^2 = x^2-36 y = (x^2-36)^.5
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