7/9=21/n

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Solution for 7/9=21/n equation: 


D( n )

n = 0

n = 0

n = 0

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

7/9 = 21/n // - 21/n

7/9-(21/n) = 0

7/9-21*n^-1 = 0

-21*n^-1 = -7/9 // : -21

n^-1 = 1/27

-1 < 0

1/(n^1) = 1/27 // * n^1

1 = 1/27*n^1 // : 1/27

27 = n^1

n = 27

n = 27

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