Simplify each of the following.

(6k+5)+(2k3)=\displaystyle {\left({6}{k}+{5}\right)}+{\left({2}{k}-{3}\right)}=  

(6k+5)(2k3)=\displaystyle {\left({6}{k}+{5}\right)}-{\left({2}{k}-{3}\right)}=  

2(6k+5)3(2k3)=\displaystyle -{2}{\left({6}{k}+{5}\right)}-{3}{\left({2}{k}-{3}\right)}=