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((2*x)/3)*x+((4*y)/5)*y = 0
2/3*x^2 = -(4/5*y^2) // : 2/3
x^2 = -6/5*y^2
x^2 = -6/5*y^2 // ^ 1/2
abs(x) = (-6/5)^(1/2)*y
x = (-6/5)^(1/2)*y or x = -((-6/5)^(1/2)*y)
x in { (-6/5)^(1/2)*y, -((-6/5)^(1/2)*y) }
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