4/9=20/n

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Solution for 4/9=20/n equation: 


D( n )

n = 0

n = 0

n = 0

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

4/9 = 20/n // - 20/n

4/9-(20/n) = 0

4/9-20*n^-1 = 0

-20*n^-1 = -4/9 // : -20

n^-1 = 1/45

-1 < 0

1/(n^1) = 1/45 // * n^1

1 = 1/45*n^1 // : 1/45

45 = n^1

n = 45

n = 45

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