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10k-9=9k+1-
We move all terms to the left:
10k-9-(9k+1-)=0
We add all the numbers together, and all the variables
10k-(+9k)-9=0
We get rid of parentheses
10k-9k-9=0
We add all the numbers together, and all the variables
k-9=0
We move all terms containing k to the left, all other terms to the right
k=9
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