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2k=21-k
We move all terms to the left:
2k-(21-k)=0
We add all the numbers together, and all the variables
2k-(-1k+21)=0
We get rid of parentheses
2k+1k-21=0
We add all the numbers together, and all the variables
3k-21=0
We move all terms containing k to the left, all other terms to the right
3k=21
k=21/3
k=7
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