There is no answer, because "-10 + k + 2" is not a question. It's just
a number, and the number that it is depends on what 'k' is.
If the teacher said "Simplify (-10 + k + 2) .", then the response is " k - 8 ".
But that's not the answer to " -10 + k + 2 ". It's the answer to "Simplify.".
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