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k-9=6k-66
We move all terms to the left:
k-9-(6k-66)=0
We get rid of parentheses
k-6k+66-9=0
We add all the numbers together, and all the variables
-5k+57=0
We move all terms containing k to the left, all other terms to the right
-5k=-57
k=-57/-5
k=11+2/5
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