69/4=90/n

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Solution for 69/4=90/n equation: 


D( n )

n = 0

n = 0

n = 0

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

69/4 = 90/n // - 90/n

69/4-(90/n) = 0

69/4-90*n^-1 = 0

-90*n^-1 = -69/4 // : -90

n^-1 = 23/120

-1 < 0

1/(n^1) = 23/120 // * n^1

1 = 23/120*n^1 // : 23/120

120/23 = n^1

n = 120/23

n = 120/23

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