3/9=21/k

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Solution for 3/9=21/k equation: 


D( k )

k = 0

k = 0

k = 0

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

3/9 = 21/k // - 21/k

3/9-(21/k) = 0

3/9-21*k^-1 = 0

-21*k^-1 = -1/3 // : -21

k^-1 = 1/63

-1 < 0

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

1 = 1/63*k^1 // : 1/63

63 = k^1

k = 63

k = 63

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