(7+i)/(7-i) - solution

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Solution for (7+i)/(7-i) equation:

D( i )

7-i = 0

7-i = 0

7-i = 0

7-i = 0 // - 7

-i = -7 // * -1

i = 7

i in (-oo:7) U (7:+oo)

(i+7)/(7-i) = 0

i+7 = 0 // - 7

i = -7

i = -7

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