(3k-18)/(42-7k)

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Solution for (3k-18)/(42-7k) equation: 


D( k )

42-(7*k) = 0

42-(7*k) = 0

42-(7*k) = 0

42-7*k = 0

42-7*k = 0 // - 42

-7*k = -42 // : -7

k = -42/(-7)

k = 6

k in (-oo:6) U (6:+oo)

(3*k-18)/(42-(7*k)) = 0

(3*k-18)/(42-7*k) = 0

3*k-18 = 0 // + 18

3*k = 18 // : 3

k = 18/3

k = 6

k in { 6} 

k belongs to the empty set

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