2/9=4/n

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Solution for 2/9=4/n equation: 


D( n )

n = 0

n = 0

n = 0

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

2/9 = 4/n // - 4/n

2/9-(4/n) = 0

2/9-4*n^-1 = 0

-4*n^-1 = -2/9 // : -4

n^-1 = 1/18

-1 < 0

1/(n^1) = 1/18 // * n^1

1 = 1/18*n^1 // : 1/18

18 = n^1

n = 18

n = 18

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