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19=13+k
We move all terms to the left:
19-(13+k)=0
We add all the numbers together, and all the variables
-(k+13)+19=0
We get rid of parentheses
-k-13+19=0
We add all the numbers together, and all the variables
-1k+6=0
We move all terms containing k to the left, all other terms to the right
-k=-6
k=-6/-1
k=+6
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