7=63/n

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Solution for 7=63/n equation: 


D( n )

n = 0

n = 0

n = 0

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

7 = 63/n // - 63/n

7-(63/n) = 0

7-63*n^-1 = 0

-63*n^-1 = -7 // : -63

n^-1 = 1/9

-1 < 0

1/(n^1) = 1/9 // * n^1

1 = 1/9*n^1 // : 1/9

9 = n^1

n = 9

n = 9

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