6/2=21/n

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Solution for 6/2=21/n equation: 


D( n )

n = 0

n = 0

n = 0

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

6/2 = 21/n // - 21/n

6/2-(21/n) = 0

6/2-21*n^-1 = 0

-21*n^-1 = -3 // : -21

n^-1 = 1/7

-1 < 0

1/(n^1) = 1/7 // * n^1

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

7 = n^1

n = 7

n = 7

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