$$1(1 \times 2-1 \times 1)-2(2 \times 2-1 \times 1)+3(2 \times 1-1 \times 1)$$
$-2$
$$1\left(2-1\times 1\right)-2\left(2\times 2-1\times 1\right)+3\left(2\times 1-1\times 1\right)$$
$$1\left(2-1\right)-2\left(2\times 2-1\times 1\right)+3\left(2\times 1-1\times 1\right)$$
$$1\times 1-2\left(2\times 2-1\times 1\right)+3\left(2\times 1-1\times 1\right)$$
$$1-2\left(2\times 2-1\times 1\right)+3\left(2\times 1-1\times 1\right)$$
$$1-2\left(4-1\times 1\right)+3\left(2\times 1-1\times 1\right)$$
$$1-2\left(4-1\right)+3\left(2\times 1-1\times 1\right)$$
$$1-2\times 3+3\left(2\times 1-1\times 1\right)$$
$$1-6+3\left(2\times 1-1\times 1\right)$$
$$-5+3\left(2\times 1-1\times 1\right)$$
$$-5+3\left(2-1\times 1\right)$$
$$-5+3\left(2-1\right)$$
$$-5+3\times 1$$
$$-5+3$$
$$-2$$
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