7/(4-9i)

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Solution for 7/(4-9i) equation: 


D( i )

4-(9*i) = 0

4-(9*i) = 0

4-(9*i) = 0

4-9*i = 0

4-9*i = 0 // - 4

-9*i = -4 // : -9

i = -4/(-9)

i = 4/9

i in (-oo:4/9) U (4/9:+oo)

7/(4-(9*i)) = 0

7/(4-9*i) = 0

i belongs to the empty set

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