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5=13+k
We move all terms to the left:
5-(13+k)=0
We add all the numbers together, and all the variables
-(k+13)+5=0
We get rid of parentheses
-k-13+5=0
We add all the numbers together, and all the variables
-1k-8=0
We move all terms containing k to the left, all other terms to the right
-k=8
k=8/-1
k=-8
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