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-11=-9-k
We move all terms to the left:
-11-(-9-k)=0
We add all the numbers together, and all the variables
-(-1k-9)-11=0
We get rid of parentheses
1k+9-11=0
We add all the numbers together, and all the variables
k-2=0
We move all terms containing k to the left, all other terms to the right
k=2
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