20/14=90/n

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Solution for 20/14=90/n equation: 


D( n )

n = 0

n = 0

n = 0

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

20/14 = 90/n // - 90/n

20/14-(90/n) = 0

20/14-90*n^-1 = 0

-90*n^-1 = -10/7 // : -90

n^-1 = 1/63

-1 < 0

1/(n^1) = 1/63 // * n^1

1 = 1/63*n^1 // : 1/63

63 = n^1

n = 63

n = 63

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