15-20i/5i

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Solution for 15-20i/5i equation: 


i in (-oo:+oo)

15-(((20*i)/5)*i) = 0

15-4*i^2 = 0

-4*i^2 = -15 // : -4

i^2 = 15/4

i^2 = 15/4 // ^ 1/2

abs(i) = (15/4)^(1/2)

i = (15/4)^(1/2) or i = -(15/4)^(1/2)

i in { (15/4)^(1/2), -(15/4)^(1/2) }

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