4-5i/5i

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Solution for 4-5i/5i equation: 


i in (-oo:+oo)

4-(((5*i)/5)*i) = 0

4-i^2 = 0

-1*i^2 = -4 // : -1

i^2 = 4

i^2 = 4 // ^ 1/2

abs(i) = 2

i = 2 or i = -2

i in { 2, -2 }

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