Factor -mk-nk

$- m k - n k$

Reorder the expression.

Move $m$ .

$- 1 k m - n k$

Move $n$ .

$- 1 k m - 1 k n$

$- 1 k m - 1 k n$

Factor $- k$ out of $- 1 k m$ .

$- 1 k (m) - 1 k n$

Factor $- k$ out of $- 1 k n$ .

$- 1 k (m) - 1 k (n)$

Factor $- 1 k$ out of $- 1 k (m) - 1 k (n)$ .

$- 1 k (m + n)$

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