Here are the answers to the equations without any explanation:

6. The missing term is 2(x + 1).

7. Infinitely many solutions

8. x = 11

9. x = 5

10. x = -4

11. Infinitely many solutions

Do you want detailed steps for any of these?

Here are five relative questions:

1. How do you determine if an equation has infinitely many solutions?
2. What conditions create no solutions in an equation?
3. Can you explain the concept of like terms in solving equations?
4. How do you simplify equations with fractions?
5. What are the steps to solve equations with variables on both sides?

Tip: Always double-check your distribution and sign handling when simplifying equations.