4/9=40/n

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Solution for 4/9=40/n equation: 


D( n )

n = 0

n = 0

n = 0

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

4/9 = 40/n // - 40/n

4/9-(40/n) = 0

4/9-40*n^-1 = 0

-40*n^-1 = -4/9 // : -40

n^-1 = 1/90

-1 < 0

1/(n^1) = 1/90 // * n^1

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

90 = n^1

n = 90

n = 90

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