Let's solve the expression step by step:

Given:  
\[ 12 ( + 2 ) - 6 - 21 \]

This expression seems to contain an unclear element "( + 2 )". I assume it's a mistake, and you meant to add 2 directly. So, I'll rewrite it as:

\[ 12 + 2 - 6 - 21 \]

Now, let's solve it:

1. Start with \(12 + 2 = 14\)
2. Then, subtract 6: \(14 - 6 = 8\)
3. Finally, subtract 21: \(8 - 21 = -13\)

So, the result is \(-13\).

Do you want further details or have any questions?

Here are 5 related questions to expand on this:

1. What is the order of operations in mathematical expressions?
2. How do parentheses affect calculations in an expression?
3. What happens if you multiply or divide by negative numbers?
4. Can we use distributive property in this kind of expression?
5. How does changing the order of operations impact the result?

**Tip:** Always double-check expressions for any potential errors or ambiguities to avoid misinterpretation!

Learn how to solve the expression 12 + 2 - 6 - 21 step-by-step with detailed explanations. This problem covers basic arithmetic operations and the order of operations in mathematics. Suitable for students in Grades 5-6.

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