Answer:
k = 4/19
Explanation:
1/3 (- 12k + 30) = 6 + 15k
- 12/3k + 30/3 = 6 + 15k
- 12/3k - 15k = 6 - 30/3
- 12/3k - 15/1k = 6/1 - 30/3
- 12/3k - 45/3k = 18/3 - 30/3
- 57/3k = - 12/3
- k = - 12/3 / 57/3
- k = - 12/3 * 3/57
- k = - 12/57
k = 12/57
k = 4/19