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i in (-oo:+oo)
2-(((3*i)/7)*i) = 0
(-3/7)*i^2+2 = 0
-3/7*i^2 = -2 // : -3/7
i^2 = 14/3
i^2 = 14/3 // ^ 1/2
abs(i) = (14/3)^(1/2)
i = (14/3)^(1/2) or i = -(14/3)^(1/2)
i in { (14/3)^(1/2), -(14/3)^(1/2) }
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