Answer:
|2 - (3/5)k| ≥ 6
2 - (3/5)k ≤ -6 or 2 - (3/5)k ≥ 6
(-3/5)k ≤ -8 or (-3/5)k ≥ 4
k ≥ 40/3 or k ≤ -20/3
k ≤ -6 2/3 or k > 13 1/3
Let k = 14: |2 - (3/5)(14)| = 6.4 > 6
Let k = -7: |2 - (3/5)(-7)| = 6.2 > 6
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