4/n=7/40

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Solution for 4/n=7/40 equation: 


D( n )

n = 0

n = 0

n = 0

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

4/n = 7/40 // - 7/40

4/n-(7/40) = 0

4/n-7/40 = 0

4*n^-1 = 7/40 // : 4

n^-1 = 7/160

-1 < 0

1/(n^1) = 7/160 // * n^1

1 = 7/160*n^1 // : 7/160

160/7 = n^1

n = 160/7

n = 160/7

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