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