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(5k - 9) - (k +3) = (11k + 9) - (5k -9)
5k - 9 - k -3 = 11k + 9 - 5k + 9
4k - 12 = 6k + 18
4k - 6k = 18 + 12
- 2k = 30
k = - 15
5k - 9 - k - 3 = 11k + 9 - 5k + 9
4k - 12 = 6k + 18
4k - 6k = 18 + 12 = 30
- 2k = 30
k = 30 : -2 = -15