21/5=63/n

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Solution for 21/5=63/n equation: 


D( n )

n = 0

n = 0

n = 0

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

21/5 = 63/n // - 63/n

21/5-(63/n) = 0

21/5-63*n^-1 = 0

-63*n^-1 = -21/5 // : -63

n^-1 = 1/15

-1 < 0

1/(n^1) = 1/15 // * n^1

1 = 1/15*n^1 // : 1/15

15 = n^1

n = 15

n = 15

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