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i in (-oo:+oo)
((3*i)/(-10))*i+9 = 0
-3/10*i^2 = -9 // : -3/10
i^2 = 30
i^2 = 30 // ^ 1/2
abs(i) = 30^(1/2)
i = 30^(1/2) or i = -30^(1/2)
i in { 30^(1/2), -30^(1/2) }
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