The first step is to re-order terms so constants are on the left.
[tex] \colorbox{pink}{(2m \: + \: 3)2} \\ \colorbox{pink}{2(2m + 3)}[/tex]
The second step is to distribute.
[tex] \colorbox{pink}{2(2m + 3)} \\ \colorbox{pink}{4m + 6}[/tex]
Then you get the answer.
[tex] \colorbox{pink}{4m + 6}[/tex]
5. 21x