28-7i/4i

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Solution for 28-7i/4i equation: 


i in (-oo:+oo)

28-(((7*i)/4)*i) = 0

(-7/4)*i^2+28 = 0

-7/4*i^2 = -28 // : -7/4

i^2 = 16

i^2 = 16 // ^ 1/2

abs(i) = 4

i = 4 or i = -4

i in { 4, -4 }

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