Let's create a single equation using the numbers 2, 5, 10, 11, 13, and 18, incorporating a variety of arithmetic operations:

$\frac{(18 - 13) \times 10}{5} + 11 = 21$

Here's how this equation is formed:

1. Subtraction:
   $18 - 13 = 5$

2. Multiplication:
   $5 \times 10 = 50$

3. Division:
   $\frac{50}{5} = 10$

4. Addition:
   $10 + 11 = 21$

Thus, the equation $\frac{(18 - 13) \times 10}{5} + 11 = 21$ is verified as true.

If you have specific requirements or want to see a different equation, feel free to let me know!

Would you like more information or have any questions? Here are some related questions you might explore:

1. How can parentheses change the outcome of an equation?
2. What are alternative ways to combine these numbers into an equation?
3. Can these numbers be used to solve a system of equations?
4. How do operations like addition and multiplication affect the final result?
5. How can I ensure that an equation using these numbers equals a specific value?
6. Can these numbers form a polynomial equation?
7. What is the role of division in simplifying expressions with these numbers?
8. How can I create equations with more complex operations using these numbers?

Tip: Using parentheses strategically can help manage the order of operations, making it easier to reach your desired outcome in equations.