18-6i/7i

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Solution for 18-6i/7i equation: 


i in (-oo:+oo)

18-(((6*i)/7)*i) = 0

(-6/7)*i^2+18 = 0

-6/7*i^2 = -18 // : -6/7

i^2 = 21

i^2 = 21 // ^ 1/2

abs(i) = 21^(1/2)

i = 21^(1/2) or i = -21^(1/2)

i in { 21^(1/2), -21^(1/2) }

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