Solve the Nested Arithmetic: What's the Result of 12 - (75 - (48 + 39))?

To solve this problem, we'll follow these steps:

• Step 1: Evaluate the innermost parentheses
• Step 2: Substitute the result and evaluate the next operation
• Step 3: Perform the outer subtraction

Let's perform these calculations:

Step 1: Calculate the innermost expression: $48 + 39$. $48 + 39 = 87$.

Step 2: Substitute back into the larger expression: $75 - 87$. This results in $75 - 87 = -12$.

Step 3: Substitute this result into the outer expression: $12 - (-12)$. Since subtracting a negative is equivalent to addition: $12 + 12 = 24$.

Therefore, the solution to the problem is $24$.