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