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x in (-oo:+oo)
x^2 = (5/3)*i // - (5/3)*i
x^2-((5/3)*i) = 0
(-5/3)*i+x^2 = 0
1*x^2 = -(-5/3*i) // : 1
x^2 = 5/3*i
x^2 = 5/3*i // ^ 1/2
abs(x) = (5/3)^(1/2)*i^(1/2)
x = (5/3)^(1/2)*i^(1/2) or x = -((5/3)^(1/2)*i^(1/2))
x in { (5/3)^(1/2)*i^(1/2), -((5/3)^(1/2)*i^(1/2)) }
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