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(x^2)/64-((9*y^2)/4) = 0
(x^2)/64+(-9/4)*y^2 = 0
1/64*x^2 = -(-9/4*y^2) // : 1/64
x^2 = 144*y^2
x^2 = 144*y^2 // ^ 1/2
abs(x) = 12*y
x = 12*y or x = -(12*y)
x in { 12*y, -(12*y) }
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