Wots the answer

-6k(7k – 9) = 0  set each factor to 0

-6k = 0   divide by -6 on each side

k = 0

7k - 9  = 0     add 9 to both sides

7k = 9           divide both sides by 7

k = 9/7

So.....k=0    or  k  = 9/7