2/20=7/n

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Solution for 2/20=7/n equation: 


D( n )

n = 0

n = 0

n = 0

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

2/20 = 7/n // - 7/n

2/20-(7/n) = 0

2/20-7*n^-1 = 0

-7*n^-1 = -1/10 // : -7

n^-1 = 1/70

-1 < 0

1/(n^1) = 1/70 // * n^1

1 = 1/70*n^1 // : 1/70

70 = n^1

n = 70

n = 70

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