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x in (-oo:+oo)
x = 75-((75/16)*y^2) // - 75-((75/16)*y^2)
x+(75/16)*y^2-75 = 0
x+75/16*y^2-75 = 0 // - 75/16*y^2-75
x = -(75/16*y^2-75)
x = 75-(75/16*y^2)
x = 75-(75/16*y^2)
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