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-11=k-7-8
We move all terms to the left:
-11-(k-7-8)=0
We add all the numbers together, and all the variables
-(k-15)-11=0
We get rid of parentheses
-k+15-11=0
We add all the numbers together, and all the variables
-1k+4=0
We move all terms containing k to the left, all other terms to the right
-k=-4
k=-4/-1
k=+4
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