3/n=7/21

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Solution for 3/n=7/21 equation: 


D( n )

n = 0

n = 0

n = 0

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

3/n = 7/21 // - 7/21

3/n-(7/21) = 0

3/n-1/3 = 0

3*n^-1 = 1/3 // : 3

n^-1 = 1/9

-1 < 0

1/(n^1) = 1/9 // * n^1

1 = 1/9*n^1 // : 1/9

9 = n^1

n = 9

n = 9

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