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-15+6k=k+8k
We move all terms to the left:
-15+6k-(k+8k)=0
We add all the numbers together, and all the variables
6k-(+9k)-15=0
We get rid of parentheses
6k-9k-15=0
We add all the numbers together, and all the variables
-3k-15=0
We move all terms containing k to the left, all other terms to the right
-3k=15
k=15/-3
k=-5
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