Answer
Factor a minus sign $(-)$ out of the second row.
Work Step by Step
$$
\left|\begin{array}{rrr}{1} & {3} & {4} \\ {-7} & {2} & {-5} \\ {6} & {1} & {2}\end{array}\right|=-\left|\begin{array}{rrr}{1} & {4} & {3} \\ {-7} & {-5} & {2} \\ {6} & {2} & {1}\end{array}\right|
$$
Factor a minus sign $(-)$ out of the second row.