Question 960624

{{{(12k^2+16k-21)+(-k^2+4k-13)-(-5k^2+k+5)}}}

{{{12k^2+16k-21-k^2+4k-13+5k^2-k-5}}}

{{{12k^2-k^2+5k^2+4k+16k-k-21-5-13}}}

{{{16k^2+19k-39}}}