30/6=90/n

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Solution for 30/6=90/n equation: 


D( n )

n = 0

n = 0

n = 0

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

30/6 = 90/n // - 90/n

30/6-(90/n) = 0

30/6-90*n^-1 = 0

-90*n^-1 = -5 // : -90

n^-1 = 1/18

-1 < 0

1/(n^1) = 1/18 // * n^1

1 = 1/18*n^1 // : 1/18

18 = n^1

n = 18

n = 18

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