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25*x^2-((1/16)*y^2) = 0
25*x^2+(-1/16)*y^2 = 0
25*x^2 = -(-1/16*y^2) // : 25
x^2 = 1/400*y^2
x^2 = 1/400*y^2 // ^ 1/2
abs(x) = 1/20*y
x = 1/20*y or x = -(1/20*y)
x in { 1/20*y, -(1/20*y) }
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