Perform the indicated operation involving rational expressions. Express final answer in simplest form. $\frac { n r + 9 n - 7 r - 63 } { n r + 5 n + 4 r + 20 } \cdot \frac { n ^ { 2 } - 16 } { n ^ { 3 } - 7 n ^ { 2 } }$

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The Answer of Perform the indicated operation involving rational expressions. Express final answer in simplest form. $\frac { n r + 9 n - 7 r - 63 } { n r + 5 n + 4 r + 20 } \cdot \frac { n ^ { 2 } - 16 } { n ^ { 3 } - 7 n ^ { 2 } }$

Perform the Indicated Operation Involving Rational Expressions nr+9n−7r−63nr+5n+4r+20⋅n2−16n3−7n2\frac { n r + 9 n - 7 r - 63 } { n r + 5 n + 4 r + 20 } \cdot \frac { n ^ { 2 } - 16 } { n ^ { 3 } - 7 n ^ { 2 } }nr+5n+4r+20nr+9n−7r−63​⋅n3−7n2n2−16​

Perform the Indicated Operation Involving Rational Expressions $\frac { n r + 9 n - 7 r - 63 } { n r + 5 n + 4 r + 20 } \cdot \frac { n ^ { 2 } - 16 } { n ^ { 3 } - 7 n ^ { 2 } }$