Solve: `7+{3xx(9-3xx2)-1}`

Answer

To solve the expression `7 + {3 × (9 - 3 × 2) - 1}`, we will follow the order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)).

### Step-by-Step Solution:

1. **Identify the expression**:
We start with the expression:
\[ 7 + \{3 \times (9 - 3 \times 2) - 1\} \]

2. **Solve the innermost parentheses**:
First, we need to solve the expression inside the parentheses `(9 - 3 × 2)`.
- Calculate \(3 \times 2\):
\[ 3 \times 2 = 6 \]
- Now substitute back into the parentheses:
\[ 9 - 6 = 3 \]
So, we have:
\[ 7 + \{3 \times 3 - 1\} \]

3. **Multiply**:
Next, we perform the multiplication:
\[ 3 \times 3 = 9 \]
Now, substitute this back into the expression:
\[ 7 + \{9 - 1\} \]

4. **Subtract**:
Now, we subtract:
\[ 9 - 1 = 8 \]
So, we have:
\[ 7 + 8 \]

5. **Add**:
Finally, we add:
\[ 7 + 8 = 15 \]

### Final Answer:
The final answer is:
\[ \boxed{15} \]