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-36*x^2-((y^2)/(-12)) = 0
-36*x^2 = -(1/12*y^2) // : -36
x^2 = 1/432*y^2
x^2 = 1/432*y^2 // ^ 1/2
abs(x) = (1/432)^(1/2)*y
x = (1/432)^(1/2)*y or x = -((1/432)^(1/2)*y)
x in { (1/432)^(1/2)*y, -((1/432)^(1/2)*y) }
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