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3k-4=k+21
We move all terms to the left:
3k-4-(k+21)=0
We get rid of parentheses
3k-k-21-4=0
We add all the numbers together, and all the variables
2k-25=0
We move all terms containing k to the left, all other terms to the right
2k=25
k=25/2
k=12+1/2
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