Question 903449
{{{5k^3 - 3k + 7-(-2k^3 + k^2 - 9)=5k^3 - 3k + 7+2k^3 +k^2 + 9}}}
{{{5k^3 - 3k + 7-(-2k^3 + k^2 - 9)=(5k^3+2k^3)-k^2 - 3k + (7+ 9)}}}
{{{5k^3 - 3k + 7-(-2k^3 + k^2 - 9)=7k^3-k^2 - 3k + 16}}}