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-19-k=2k+20
We move all terms to the left:
-19-k-(2k+20)=0
We add all the numbers together, and all the variables
-1k-(2k+20)-19=0
We get rid of parentheses
-1k-2k-20-19=0
We add all the numbers together, and all the variables
-3k-39=0
We move all terms containing k to the left, all other terms to the right
-3k=39
k=39/-3
k=-13
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