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11=8-k+1
We move all terms to the left:
11-(8-k+1)=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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