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-9=6k+3k
We move all terms to the left:
-9-(6k+3k)=0
We add all the numbers together, and all the variables
-(+9k)-9=0
We get rid of parentheses
-9k-9=0
We move all terms containing k to the left, all other terms to the right
-9k=9
k=9/-9
k=-1
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