The mathematical expression in the image appears to be:

$(-9 - (-10)) \cdot [(-4) - 8(-4)^2 + (-10)]$

Let's simplify it step by step.

Step 1: Simplify the first part.

$-9 - (-10) = -9 + 10 = 1$

Step 2: Simplify the expression in the brackets.

The expression inside the brackets is: $(-4) - 8(-4)^2 + (-10)$

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