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-15-7k=-6k-7
We move all terms to the left:
-15-7k-(-6k-7)=0
We get rid of parentheses
-7k+6k+7-15=0
We add all the numbers together, and all the variables
-1k-8=0
We move all terms containing k to the left, all other terms to the right
-k=8
k=8/-1
k=-8
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