`[{12-bar(14-8) + 7}-15]`

Explanation

To solve the expression \([{12 - \text{bar}(14 - 8) + 7} - 15]\) step by step using the BODMAS rule, we will follow these steps:

### Step 1: Solve the expression inside the bar
First, we need to calculate \(14 - 8\).

\[ 14 - 8 = 6 \]

### Step 2: Substitute the value back into the expression
Now, we substitute \(6\) back into the expression:

\[ 12 - 6 + 7 - 15 \]

### Step 3: Solve the expression from left to right
Next, we will perform the operations from left to right.

First, we calculate \(12 - 6\):

\[ 12 - 6 = 6 \]

Now, substitute this value back into the expression:

\[ 6 + 7 - 15 \]

### Step 4: Continue solving the expression
Next, we calculate \(6 + 7\):

\[ 6 + 7 = 13 \]

Now, substitute this value back into the expression:

\[ 13 - 15 \]

### Step 5: Final subtraction
Finally, we calculate \(13 - 15\):

\[ 13 - 15 = -2 \]

### Final Answer
The final answer is \(-2\).

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