Answer:
K= -240
2/6k + 80 = 3/6k +120
2/6k -2/6k + 80 = 3/6k-2/6k +120
80 = 1/6k + 120
80 -120 = 1/6k +120 -120
-40 = 1/6k
-40 / 1/6 = 1/6k / 1/6
k = -240
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