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2k+7=-12k
We move all terms to the left:
2k+7-(-12k)=0
We get rid of parentheses
2k+12k+7=0
We add all the numbers together, and all the variables
14k+7=0
We move all terms containing k to the left, all other terms to the right
14k=-7
k=-7/14
k=-1/2
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