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Anonymous
That depends on the value assigned to the variable "k". If you don't know the value of "k", you express the sum as 11 + k; in this case, you can't simplify it any more.
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11 + k
The sum of 11 and 7 is 18.
k12
The sum of 8, 11 and 9 is 28.
(9+k)-17=x