12k +6 = 4k-8 subtract 4k from each side
-4k -4k
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8k +6 = -8 subtract 6 from each side
-6 -6
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8k = -14 divide by 8
k = -14/8
k = -1 3/4
none of your choices match the problem.
either there is a typo in the problem or the answers