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-15-2k=9k+7
We move all terms to the left:
-15-2k-(9k+7)=0
We get rid of parentheses
-2k-9k-7-15=0
We add all the numbers together, and all the variables
-11k-22=0
We move all terms containing k to the left, all other terms to the right
-11k=22
k=22/-11
k=-2
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