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2(k-7)=k-13
We move all terms to the left:
2(k-7)-(k-13)=0
We multiply parentheses
2k-(k-13)-14=0
We get rid of parentheses
2k-k+13-14=0
We add all the numbers together, and all the variables
k-1=0
We move all terms containing k to the left, all other terms to the right
k=1
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