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