$$[3 \times (5-2)-10/2] \times [5 \times (1-4)-(3-7)]$$
$-44$
$$\left(3\times 3-\frac{10}{2}\right)\left(5\left(1-4\right)-\left(3-7\right)\right)$$
$$\left(9-\frac{10}{2}\right)\left(5\left(1-4\right)-\left(3-7\right)\right)$$
$$\left(9-5\right)\left(5\left(1-4\right)-\left(3-7\right)\right)$$
$$4\left(5\left(1-4\right)-\left(3-7\right)\right)$$
$$4\left(5\left(-3\right)-\left(3-7\right)\right)$$
$$4\left(-15-\left(3-7\right)\right)$$
$$4\left(-15-\left(-4\right)\right)$$
$$4\left(-15+4\right)$$
$$4\left(-11\right)$$
$$-44$$
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