4/30=12/i

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Solution for 4/30=12/i equation: 


D( i )

i = 0

i = 0

i = 0

i in (-oo:0) U (0:+oo)

4/30 = 12/i // - 12/i

4/30-(12/i) = 0

4/30-12*i^-1 = 0

-12*i^-1 = -2/15 // : -12

i^-1 = 1/90

-1 < 0

1/(i^1) = 1/90 // * i^1

1 = 1/90*i^1 // : 1/90

90 = i^1

i = 90

i = 90

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