30/18=21/n

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Solution for 30/18=21/n equation: 


D( n )

n = 0

n = 0

n = 0

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

30/18 = 21/n // - 21/n

30/18-(21/n) = 0

30/18-21*n^-1 = 0

-21*n^-1 = -5/3 // : -21

n^-1 = 5/63

-1 < 0

1/(n^1) = 5/63 // * n^1

1 = 5/63*n^1 // : 5/63

63/5 = n^1

n = 63/5

n = 63/5

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