[tex]\huge{\boxed{5(c+2d)+7}}[/tex]
Factor out a greatest common factor of [tex]5[/tex] from [tex]5c+10d[/tex]. [tex]\boxed{5(c+2d)+7}[/tex]
We leave the [tex]7[/tex] because it is a prime number and as such, has no other factors other than [tex]1[/tex] and itself.
