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16-x^2-(5/9) = 0
16-x^2-5/9 = 0
-1*x^2 = -139/9 // : -1
x^2 = 139/9
x^2 = 139/9 // ^ 1/2
abs(x) = (139/9)^(1/2)
x = (139/9)^(1/2) or x = -(139/9)^(1/2)
x in { (139/9)^(1/2), -(139/9)^(1/2) }
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