7/n=21/27

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Solution for 7/n=21/27 equation: 


D( n )

n = 0

n = 0

n = 0

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

7/n = 21/27 // - 21/27

7/n-(21/27) = 0

7/n-7/9 = 0

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

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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