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6=k+0
We move all terms to the left:
6-(k+0)=0
We add all the numbers together, and all the variables
-(+k)+6=0
We get rid of parentheses
-k+6=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