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x in (-oo:+oo)
((2*y)/3)*y-5 = x // - x
((2*y)/3)*y-x-5 = 0
2/3*y^2-x-5 = 0 // - 2/3*y^2-5
-x = -(2/3*y^2-5) // * -1
x = 2/3*y^2-5
x = 2/3*y^2-5
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