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9+2k=18+k
We move all terms to the left:
9+2k-(18+k)=0
We add all the numbers together, and all the variables
2k-(k+18)+9=0
We get rid of parentheses
2k-k-18+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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