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13-2k=5k-8
We move all terms to the left:
13-2k-(5k-8)=0
We get rid of parentheses
-2k-5k+8+13=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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