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-2k=9k+55
We move all terms to the left:
-2k-(9k+55)=0
We get rid of parentheses
-2k-9k-55=0
We add all the numbers together, and all the variables
-11k-55=0
We move all terms containing k to the left, all other terms to the right
-11k=55
k=55/-11
k=-5
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