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10-9=k-11
We move all terms to the left:
10-9-(k-11)=0
We add all the numbers together, and all the variables
-(k-11)+1=0
We get rid of parentheses
-k+11+1=0
We add all the numbers together, and all the variables
-1k+12=0
We move all terms containing k to the left, all other terms to the right
-k=-12
k=-12/-1
k=+12
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