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i in (-oo:+oo)
((3*i)/10)*i-3 = 0
3/10*i^2 = 3 // : 3/10
i^2 = 10
i^2 = 10 // ^ 1/2
abs(i) = 10^(1/2)
i = 10^(1/2) or i = -10^(1/2)
i in { 10^(1/2), -10^(1/2) }
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