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13k+15=k-7
We move all terms to the left:
13k+15-(k-7)=0
We get rid of parentheses
13k-k+7+15=0
We add all the numbers together, and all the variables
12k+22=0
We move all terms containing k to the left, all other terms to the right
12k=-22
k=-22/12
k=-1+5/6
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