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-19=-18-k
We move all terms to the left:
-19-(-18-k)=0
We add all the numbers together, and all the variables
-(-1k-18)-19=0
We get rid of parentheses
1k+18-19=0
We add all the numbers together, and all the variables
k-1=0
We move all terms containing k to the left, all other terms to the right
k=1
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