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-19=-6k-7k
We move all terms to the left:
-19-(-6k-7k)=0
We add all the numbers together, and all the variables
-(-13k)-19=0
We get rid of parentheses
13k-19=0
We move all terms containing k to the left, all other terms to the right
13k=19
k=19/13
k=1+6/13
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