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9*x^2-((y^2)/100) = 0
9*x^2 = -(-1/100*y^2) // : 9
x^2 = 1/900*y^2
x^2 = 1/900*y^2 // ^ 1/2
abs(x) = 1/30*y
x = 1/30*y or x = -(1/30*y)
x in { 1/30*y, -(1/30*y) }
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