Answer
Multiply the second row by $-1$.
Work Step by Step
Given $$
\left|\begin{array}{rrr}{5} & {4} & {2} \\ {4} & {-3} & {4} \\ {7} & {6} & {3}\end{array}\right|=-\left|\begin{array}{rrr}{5} & {4} & {2} \\ {-4} & {3} & {-4} \\ {7} & {6} & {3}\end{array}\right|.
$$
Multiply the second row by $-1$.
