5/2=40/n

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Solution for 5/2=40/n equation: 


D( n )

n = 0

n = 0

n = 0

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

5/2 = 40/n // - 40/n

5/2-(40/n) = 0

5/2-40*n^-1 = 0

-40*n^-1 = -5/2 // : -40

n^-1 = 1/16

-1 < 0

1/(n^1) = 1/16 // * n^1

1 = 1/16*n^1 // : 1/16

16 = n^1

n = 16

n = 16

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