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5(k-4)+3k=k+1
We move all terms to the left:
5(k-4)+3k-(k+1)=0
We add all the numbers together, and all the variables
3k+5(k-4)-(k+1)=0
We multiply parentheses
3k+5k-(k+1)-20=0
We get rid of parentheses
3k+5k-k-1-20=0
We add all the numbers together, and all the variables
7k-21=0
We move all terms containing k to the left, all other terms to the right
7k=21
k=21/7
k=3
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