Answer :

Let's solve the expression step-by-step.

The expression to evaluate is:

[tex]\[12 \times\{-5+(-2)[9-6(15-24)]\}\][/tex]

1. Innermost Parentheses:

Start by evaluating the innermost expression within the parentheses:
[tex]\[ 15 - 24 = -9 \][/tex]

2. Inside the Square Brackets:

Next, substitute [tex]\(-9\)[/tex] back into the expression within the square brackets:
[tex]\[ 9 - 6(-9) \][/tex]
Now, multiply [tex]\( -6 \)[/tex] by [tex]\(-9\)[/tex]:
[tex]\[ -6 \times (-9) = 54 \][/tex]
So, the expression inside the brackets becomes:
[tex]\[ 9 + 54 = 63 \][/tex]

3. Inside the Braces:

Replace the computed value [tex]\( 63 \)[/tex] into the expression with the braces:
[tex]\[ -5 + (-2)[63] \][/tex]
Then, multiply [tex]\( -2 \)[/tex] by [tex]\( 63 \)[/tex]:
[tex]\[ -2 \times 63 = -126 \][/tex]
Now add [tex]\( -126 \)[/tex] to [tex]\( -5 \)[/tex]:
[tex]\[ -5 - 126 = -131 \][/tex]

4. Final Multiplication:

Lastly, multiply the value inside the braces by 12:
[tex]\[ 12 \times (-131) = -1572 \][/tex]

Therefore, the result of the expression is:

[tex]\[ \boxed{-1572} \][/tex]