For the person responding, can you please explain the logic of how you set up the equation.

Thank anyone who responds in advance

Q) The sum of two numbers is 15. Three times one of the numbers is 11 less than five times the other. Find the numbers.

*from the back of the book, I already know that the answer is 6, 7,

What I put together was

3x=5x-11 but considering that there are two number to answer for, I realize I am wrong.