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(2/3)*x^2-412 = 0
2/3*x^2 = 412 // : 2/3
x^2 = 618
x^2 = 618 // ^ 1/2
abs(x) = 618^(1/2)
x = 618^(1/2) or x = -618^(1/2)
x in { 618^(1/2), -618^(1/2) }
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