This is the equation of their combined collection of comic books: 3(j +b)=66
Finally we simplify: Julian= b+12 --> 12 more than Ben 3(j+b)=66 --> our equation 3(b+12+b) --> j replaced in terms of b 3(2b+12)=66 --> our equation to solve for b
b= # of comic books Ben has b+12= # of comic books Julian has
3(b+ (b+12) =66 3(2b+12)=66 6b+36=66 6b=30 b=5
**Hope this helps you! Feel free to message me if you have any further questions. Have a nice day! :)**