Answer
$b=\{ 5, -5, 7, -7 \}$
Work Step by Step
The factors of 6 are $
\{2,3\}, \{-2,-3\}, \{1,6\}, \{-1,-6\}.$ Getting the sum of these factors, then $
b=\{ 5, -5, 7, -7 \}
$.
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