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(x^2)/9-((y^2)/16) = 0
1/9*x^2 = -(-1/16*y^2) // : 1/9
x^2 = 9/16*y^2
x^2 = 9/16*y^2 // ^ 1/2
abs(x) = 3/4*y
x = 3/4*y or x = -(3/4*y)
x in { 3/4*y, -(3/4*y) }
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